a decreasing trendp-values < 0.0001
an increasing trendp-values < 0.0001
However, there was a change in pattern of incidence for some case types over time with preterm rupture of membrane, preeclampsia, and preterm labour showing a decreasing trend (p-values < 0.0001) and fetal anomaly showing an increasing trend (p-values < 0.0001).