3.5 The results of subgroup analysis
Among subjects with pregnancy complications, PTB rates were high
regardless of whether they exercised or not, and the adjusted OR(95%CI ) for the risk of PTB related to exercise during pregnancy
was 0.87 (0.45-1.74), which was not significant. Among subjects without
pregnancy complications, exercise during pregnancy was associated with
PTB, and the adjusted OR (95%CI ) was 0.72 (0.55-0.95)
(Table 3). However, after interaction analysis, no statistically
significant interaction terms were found.