Seasonality in twin birth rates, Denmark, 1936-84
Bibliographic Data
| ID | 11172520 |
|---|---|
| Authors | B Bonnelykke (University Psychiatric Hospital), Jes Søgaard (University Psychiatric Hospital), Jannie Nielsen (0000-0003-4897-8705, University Psychiatric Hospital) |
| Year | 1987 |
| Volume | 41 |
| Issue | 4 |
| Pages | 338-343 |
| Publication date | 1987-12-01 |
| Peer Reviewed | Yes |
| Open Access | No |
| Type | ARTICLE |
| Venue | Journal of Epidemiology and Community Health (JOURNAL) |
| Journal identifiers | ISSN: 0143-005X • E-ISSN: 1470-2738 |
| Publisher | BMJ (PUBLISHER • GB) |
| DOI | 10.1136/jech.41.4.338 |
| PMID | 3455428 |
| OpenAlex | W2094581354 |
| Language | EN |
| Citations received | 1 |
| References cited | 22 |
A study was made of seasonality in twin birth rate in Denmark between 1977 and 1984. We studied all twin births (N = 45,550) in all deliveries (N = 3,679,932) during that period. Statistical analysis using a simple harmonic sinusoidal model provided no evidence for seasonality. However, sequential polynomial analysis disclosed a significant fit to a fifth order polynomial curve with peaks in twin birth rates in May-June and December, along with troughs in February and September. A falling trend in twinning rate broke off in Denmark around 1970, and from 1970 to 1984 an increasing trend was found. The results are discussed in terms of possible environmental influences on twinning
Birth order · Birth rate · Crystal twinning · Population · Research methodology · Seasonality · Statistics · Twin study · Assisted Reproductive Technology and Twin Pregnancy · Demography · Mathematics · Medicine
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| Unique citing works | 1 |
|---|---|
| Citations per year | 1 |
| Citation span | 2025 - 2025 (1) |
| Citation velocity | recent |
| Highly cited | No |
| Citation types | Neutral: 1 |