Table I.
Reproductive outcome in girls with or without menstrual irregularity at 16 years of age.
| Menstrual irregularitya at 16 years | Nb | Reproductive outcome at 26 years |
P-value | |
|---|---|---|---|---|
| No pregnancies (N/%) | At least one pregnancy (N/%) | |||
| No | 1252 | 402/32.1 | 850/67.9 | |
| Yes | 482 | 154/32.0 | 328/68.0 | 0.950 |
| No deliveries (N/%) | At least one delivery (N/%) | |||
| No | 1252 | 900/71.9 | 352/28.1 | |
| Yes | 482 | 358/74.3 | 124/25.7 | 0.318 |
| No miscarriagesc (N/%) | At least one miscarriagec (N/%) | |||
| No | 850 | 747/87.9 | 103/12.1 | |
| Yes | 328 | 290/88.4 | 38/11.6 | 0.801 |
| Number of pregnancies [mean (SD)] | ||||
| No | 1252 | 0.71 (1.18) | ||
| Yes | 482 | 0.64 (1.10) | 0.249 | |
| Number of deliveries [mean (SD)] | ||||
| No | 1252 | 0.47 (0.88) | ||
| Yes | 482 | 0.44 (0.86) | 0.410 | |
| Number of miscarriagesc [mean (SD)] | ||||
| No | 850 | 0.16 (0.48) | ||
| Yes | 328 | 0.15 (0.46) | 0.712 | |
The significance tests used are the Chi-squared (χ2) test and Student's t-test.
aIn the 26-year questionnaire, women who reported menstruation cycle longer than 35 days (option 3), extremely irregular (option 4) or had amenorrhoea (option 5) were considered to have ‘menstrual irregularity’.
bThe numbers of non-symptomatic and symptomatic women in separate analyses varies due to non-response to some items.
cWomen who had not been pregnant by the age of 26 were excluded from the miscarriage analysis.