In Table 2, we present unadjusted and adjusted ORs with 95% CIs for child health outcomes in the 2001 and 2010 cohorts. When children were at the age of 18 months, we observed a linear relationship between older maternal age and lower risks of both unintentional injuries and hospital admission. Even after controlling for potential confounders such as educational attainment of parents, the favorable outcomes remained statistically significant among older maternal age groups compared to the youngest maternal age group. For example, compared to mothers <25 years, ORs of hospital admission were 0.76 [95% CI: 0.65, 0.90] for mothers aged 35.0–39.9 and 0.71 [0.51, 0.98] for >40.0 years, respectively. We statistically confirmed a linear trend by maternal age: ptrend<0.01 for both unintentional injuries and hospital admission. Lower risks among older mothers and the linear relationship between maternal age and child health remained after adjusting for preterm births and birthweight [the Mediator-adjusted Model in the table]. When children were at the age of 66 months, the risks of hospital admission were lower among older maternal age groups. However, the associations attenuated toward null once we controlled for potential confounders.