Variable | Unstandardized beta | p value | 95% confidence interval | ||
---|---|---|---|---|---|
Model 1: Linear regression taking the girl’s age at menarche as the dependent variable and taking the NICU admission due to any cause as an independent variable | |||||
 Mother’s age at menarche | 0.209 | 0.009 | 0.052 | 0.366 | |
 Gestational age | 0.069 | 0.018 | 0.012 | 0.125 | |
 Asthma during childhood in the girl (yes vs no*) | − 0.526 | 0.020 | − 0.969 | − 0.083 | |
Model 2: Linear regression taking the girl’s age at menarche as the dependent variable and taking each cause for NICU admission as an independent variable | |||||
 Number of days of phototherapy | − 0.128 | < 0.001 | − 0.198 | − 0.059 | |
 Mother’s age at menarche | 0.223 | < 0.001 | 0.107 | 0.340 | |
 Preeclampsia during pregnancy (yes vs no*) | − 1.168 | 0.022 | − 2.163 | − 0.172 | |
 Asthma during childhood in the girl (yes vs no*) | − 0.504 | 0.024 | − 0.941 | 0.068 |