Johan Fellman
Biographic Data
| ID | 3811341 |
|---|---|
| NAME | Johan Fellman |
| GIVEN NAMES | Johan |
| FAMILY NAME | Fellman |
| SIGNATURE | FELLMAN J |
| AFFILIATIONS | Folkhälsans Forskningscentrum |
| ORCID | 0000-0002-7162-7121 |
| VERIFIED | Yes |
| TOTAL WORKS | 11 |
| TOTAL CITATIONS | 19 |
| AUTHOR COUNT | 11 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1988 |
| LATEST PUBLICATION YEAR | 2011 |
| H-INDEX | 3 |
Temporal Trends in the Secondary Sex Ratio in Nordic Countries
Attempts have been made to identify factors influencing the number of males per 100 females at birth, also called the secondary sex ratio. It has been proposed to vary inversely with the frequency of prenatal losses, but available data lend at best only weak support for this hypothesis. Statistical analyses have shown that comparisons between secondary sex ratios demand large data sets. Variations in the secondary sex ratio that have been reliabl…
Temporal and Regional Variations in the Seasonality of Births in Åland (Finland), 1653–1950
Monthly numbers of births are influenced by the length of the month and, thus, rates per day should be used. Comparisons of seasonality in data sets of different sizes must be based on standardized indices. Although strong seasonality exists, a poor model may incorrectly yield low seasonality measures. The standard deviation of the inter-monthly variation in the indices has been used as a seasonality measure. We introduce a new measure based on a…
Correlations Between Live and Stillbirth Outcomes in Twin Pairs
A relationship has been proposed to exist between individual outcomes (live or stillbirth) of twins in the same set. Here, we analyze this association between live births and stillbirths among individuals in different twin pairs. When national birth registers are analyzed, individuals in opposite-sex twin sets can be identified and the correlation between individual outcomes estimated. However, full information about the individuals in same-sex t…
Temporal, Seasonal, and Regional Differences in Births and Deaths in land (Finland)
A good knowledge of the seasonal variation during normal years is of fundamental importance for analyses of the effects of wars, famines, epidemics, or similar privations on births and deaths. In this study we consider data from the Åland Islands (Finland) for 1650–1950. During the period 1650–1793 there are subperiods with missing data for all parishes, and consequently the total data for the Åland Islands for this period have to be estimated us…
Temporal, Seasonal, and Regional Differences in Births and Deaths in Åland (Finland)
A good knowledge of the seasonal variation during normal years is of fundamental importance for analyses of the effects of wars, famines, epidemics, or similar privations on births and deaths. In this study we consider data from the Aland Islands (Finland) for 1650-1950. During the period 1650-1793 there are subperiods with missing data for all parishes, and consequently the total data for the Aland Islands for this period have to be estimated us…
Weinberg's Differential Rule Reconsidered
A central problem in research on twins is the estimation of the rates of monozygotic and dizygotic twin maternities. The estimation usually follows Weinberg's differential rule. According to this rule, the rate of dizygotic twinning is twice the rate of twin maternities in which the twins are of opposite sex. The monozygotic twinning rate is the difference between the rates of same-sex and opposite-sex twin sets. Weinberg's differential rule is i…
Regional, temporal, and seasonal variations in births and deaths: The effects of famines
A knowledge of the seasonal variation in births and deaths during normal years is important for analyses of the effects of wars, famines, epidemics or similar privations on these two variables. In studies of seasonality, multiple trigonometric regression models are more flexible than the simple sine curve. The seasonal variation in mortality in Iceland, 1856-1990, shows a strong secular decrease, and a connection between this and the epidemiologi…
Consanguinity avoidance and mate choice in Sottunga, Finland
Potential mates analysis is used to determine some of the social and demographic characteristics that influence mate choice in a small island population. Potential mate pools are defined for males in this population; characteristics such as population size and composition with respect to consanguinity are specified. Determinants of mate choice are examined in light of mate availability and potential mate pool characteristics for endogamous maters…
Marital migration and genetic structure in Kitee, Finland
A genetic analysis of marital migration in Kitee, Finland, is presented. The data are based on 9970 marriages which took place between 1750 and 1877. The results of this analysis are compared with those of previous studies of the population of the Åland Islands, Finland. Analysis of inter-subdivision genetic kinship matrices shows that genetic heterogeneity in Kitee is substantially less than in Åland. This is due primarily to higher rates of mig…
Founder effect and genetic disease in Sottunga, Finland
Pedigree data are analyzed in order to determine the factors responsible for the high frequencies of certain genetic disorders in an isolated Swedish‐speaking population of Finland's Å land archipelago. The founders of Sottunga are identified, and the genetic contributions of each founder to descending birth cohorts are estimated. Founders born before 1700 have far more descendants in the contemporary gene pool than do more recent founders. Howev…
Inbreeding and genetic disease in Sottunga, Finland
The contribution of inbreeding to the prevalence of recessive genetic diseases in the Åland Island parish of Sottunga is investigated. Genealogical data for 3,030 individuals spanning up to 15 generations were used to estimate inbreeding. This small island community shows a low average inbreeding value of .0031 for the period 1725–1975. A cohort analysis shows that inbreeding increased from 1750 to 1900, when maximum inbreeding for those born in …
Founder effect and genetic disease in Sottunga, Finland
Pedigree data are analyzed in order to determine the factors responsible for the high frequencies of certain genetic disorders in an isolated Swedish‐speaking population of Finland's Å land archipelago. The founders of Sottunga are identified, and the genetic contributions of each founder to descending birth cohorts are estimated. Founders born before 1700 have far more descendants in the contemporary gene pool than do more recent founders. Howev…
Weinberg's Differential Rule Reconsidered
A central problem in research on twins is the estimation of the rates of monozygotic and dizygotic twin maternities. The estimation usually follows Weinberg's differential rule. According to this rule, the rate of dizygotic twinning is twice the rate of twin maternities in which the twins are of opposite sex. The monozygotic twinning rate is the difference between the rates of same-sex and opposite-sex twin sets. Weinberg's differential rule is i…
Inbreeding and genetic disease in Sottunga, Finland
The contribution of inbreeding to the prevalence of recessive genetic diseases in the Åland Island parish of Sottunga is investigated. Genealogical data for 3,030 individuals spanning up to 15 generations were used to estimate inbreeding. This small island community shows a low average inbreeding value of .0031 for the period 1725–1975. A cohort analysis shows that inbreeding increased from 1750 to 1900, when maximum inbreeding for those born in …
Temporal Trends in the Secondary Sex Ratio in Nordic Countries
Attempts have been made to identify factors influencing the number of males per 100 females at birth, also called the secondary sex ratio. It has been proposed to vary inversely with the frequency of prenatal losses, but available data lend at best only weak support for this hypothesis. Statistical analyses have shown that comparisons between secondary sex ratios demand large data sets. Variations in the secondary sex ratio that have been reliabl…
Temporal, Seasonal, and Regional Differences in Births and Deaths in Åland (Finland)
A good knowledge of the seasonal variation during normal years is of fundamental importance for analyses of the effects of wars, famines, epidemics, or similar privations on births and deaths. In this study we consider data from the Aland Islands (Finland) for 1650-1950. During the period 1650-1793 there are subperiods with missing data for all parishes, and consequently the total data for the Aland Islands for this period have to be estimated us…
Regional, temporal, and seasonal variations in births and deaths: The effects of famines
A knowledge of the seasonal variation in births and deaths during normal years is important for analyses of the effects of wars, famines, epidemics or similar privations on these two variables. In studies of seasonality, multiple trigonometric regression models are more flexible than the simple sine curve. The seasonal variation in mortality in Iceland, 1856-1990, shows a strong secular decrease, and a connection between this and the epidemiologi…
Marital migration and genetic structure in Kitee, Finland
A genetic analysis of marital migration in Kitee, Finland, is presented. The data are based on 9970 marriages which took place between 1750 and 1877. The results of this analysis are compared with those of previous studies of the population of the Åland Islands, Finland. Analysis of inter-subdivision genetic kinship matrices shows that genetic heterogeneity in Kitee is substantially less than in Åland. This is due primarily to higher rates of mig…
Founder effect and genetic disease in Sottunga, Finland
Pedigree data are analyzed in order to determine the factors responsible for the high frequencies of certain genetic disorders in an isolated Swedish‐speaking population of Finland's Å land archipelago. The founders of Sottunga are identified, and the genetic contributions of each founder to descending birth cohorts are estimated. Founders born before 1700 have far more descendants in the contemporary gene pool than do more recent founders. Howev…
Inbreeding and genetic disease in Sottunga, Finland
The contribution of inbreeding to the prevalence of recessive genetic diseases in the Åland Island parish of Sottunga is investigated. Genealogical data for 3,030 individuals spanning up to 15 generations were used to estimate inbreeding. This small island community shows a low average inbreeding value of .0031 for the period 1725–1975. A cohort analysis shows that inbreeding increased from 1750 to 1900, when maximum inbreeding for those born in …
Consanguinity avoidance and mate choice in Sottunga, Finland
Potential mates analysis is used to determine some of the social and demographic characteristics that influence mate choice in a small island population. Potential mate pools are defined for males in this population; characteristics such as population size and composition with respect to consanguinity are specified. Determinants of mate choice are examined in light of mate availability and potential mate pool characteristics for endogamous maters…
Regional, temporal, and seasonal variations in births and deaths: The effects of famines
A knowledge of the seasonal variation in births and deaths during normal years is important for analyses of the effects of wars, famines, epidemics or similar privations on these two variables. In studies of seasonality, multiple trigonometric regression models are more flexible than the simple sine curve. The seasonal variation in mortality in Iceland, 1856-1990, shows a strong secular decrease, and a connection between this and the epidemiologi…
Weinberg's Differential Rule Reconsidered
A central problem in research on twins is the estimation of the rates of monozygotic and dizygotic twin maternities. The estimation usually follows Weinberg's differential rule. According to this rule, the rate of dizygotic twinning is twice the rate of twin maternities in which the twins are of opposite sex. The monozygotic twinning rate is the difference between the rates of same-sex and opposite-sex twin sets. Weinberg's differential rule is i…
Correlations Between Live and Stillbirth Outcomes in Twin Pairs
A relationship has been proposed to exist between individual outcomes (live or stillbirth) of twins in the same set. Here, we analyze this association between live births and stillbirths among individuals in different twin pairs. When national birth registers are analyzed, individuals in opposite-sex twin sets can be identified and the correlation between individual outcomes estimated. However, full information about the individuals in same-sex t…
Temporal, Seasonal, and Regional Differences in Births and Deaths in land (Finland)
A good knowledge of the seasonal variation during normal years is of fundamental importance for analyses of the effects of wars, famines, epidemics, or similar privations on births and deaths. In this study we consider data from the Åland Islands (Finland) for 1650–1950. During the period 1650–1793 there are subperiods with missing data for all parishes, and consequently the total data for the Åland Islands for this period have to be estimated us…
Temporal, Seasonal, and Regional Differences in Births and Deaths in Åland (Finland)
A good knowledge of the seasonal variation during normal years is of fundamental importance for analyses of the effects of wars, famines, epidemics, or similar privations on births and deaths. In this study we consider data from the Aland Islands (Finland) for 1650-1950. During the period 1650-1793 there are subperiods with missing data for all parishes, and consequently the total data for the Aland Islands for this period have to be estimated us…
Temporal and Regional Variations in the Seasonality of Births in Åland (Finland), 1653–1950
Monthly numbers of births are influenced by the length of the month and, thus, rates per day should be used. Comparisons of seasonality in data sets of different sizes must be based on standardized indices. Although strong seasonality exists, a poor model may incorrectly yield low seasonality measures. The standard deviation of the inter-monthly variation in the indices has been used as a seasonality measure. We introduce a new measure based on a…
Temporal Trends in the Secondary Sex Ratio in Nordic Countries
Attempts have been made to identify factors influencing the number of males per 100 females at birth, also called the secondary sex ratio. It has been proposed to vary inversely with the frequency of prenatal losses, but available data lend at best only weak support for this hypothesis. Statistical analyses have shown that comparisons between secondary sex ratios demand large data sets. Variations in the secondary sex ratio that have been reliabl…
Demography (9 works) · Biology (8 works) · Geography (6 works) · Birth, Development, and Health (5 works) · Genetics (5 works) · Genetics (5 works) · Population (5 works) · Demographic Trends and Gender Preferences (4 works) · Insurance, Mortality, Demography, Risk Management (4 works) · Mathematics (4 works)