Table 3.
Individual birth defects by month of LMP (time of conception)
| Birth defects (per 100 000)* | |||
|---|---|---|---|
| Birth defect type | April–July | Other months | p-value |
| Spina | 21.93 (0.50) | 20.31 (0.34) | <0.01 |
| Circul | 134.99 (1.25) | 131.09 (0.85) | <0.01 |
| Cleftlip | 83.09 (0.98) | 79.07 (0.66) | <0.01 |
| Adactyly | 85.65 (1.00) | 81.88 (0.68) | <0.01 |
| Musculo | 223.49 (1.61) | 217.36 (1.11) | <0.01 |
| Down | 46.23 (0.74) | 43.22 (0.49) | <0.01 |
| Othercon | 455.89 (2.33) | 443.89 (1.59) | <0.01 |
| Tracheo | 13.33 (0.39) | 12.32 (0.26) | <0.05 |
| Gastro | 32.22 (0.61) | 30.82 (0.42) | <0.05 |
| Urogen | 105.37 (1.11) | 102.54 (0.76) | <0.05 |
| Clubfoot | 58.17 (0.82) | 56.23 (0.56) | <0.05 |
| Anen | 10.70 (0.35) | 10.67 (0.24) | NS† |
| Hydro | 23.24 (0.52) | 22.80 (0.36) | NS† |
| Micro | 6.30 (0.27) | 6.08 (0.18) | NS† |
| Nervous | 20.97 (0.49) | 20.98 (0.34) | NS† |
| Heart | 118.85 (1.18) | 117.44 (0.82) | NS† |
| Rectal | 9.05 (0.32) | 8.39 (0.22) | NS† |
| Omphalo | 28.89 (0.58) | 28.10 (0.40) | NS† |
| Genital | 79.36 (0.96) | 79.09 (0.66) | NS† |
| Renalage | 13.99 (0.40) | 13.52 (0.28) | NS† |
| Hernia | 12.11 (0.38) | 11.83 (0.26) | NS† |
| Chromo | 36.24 (0.65) | 34.91 (0.44) | NS† |
*
Values in cells are mean (standard error) adjusting for years.
†
NS = not significant with p > 0.05. p-values are obtained from logistic regression models.