Figure 2

Associations between multiple health complaints (MHC) (yes/no) and number of hospital contacts stratified by sex. Presented as incidence rate ratios (IRR) [95% CI]. Model 1 was unadjusted. Model 2: Model 1 + adjustment for age at index date. Model 3: Model 2 + adjustment for existing somatic and psychiatric morbidity. Model 3b: Model 2 + adjustment for Charlson Comorbidity Index (CCI) score. Model 4: Model 3 + adjustment for maternal parity at the birth of the child, the last completed education by the mother, and parental cohabitation (yes/no) at the child’s index date.