Table 4

Crude and fully adjusted ORs for the effect of parity and maternal education on caesarean section and LBW in the birth registry population and in the NINFEA cohort, together with the corresponding relative ORs

OutcomeCrude OR (95% CI)Fully adjusted OR (95% CI)
Risk factorsPBRNINFEARORPBRNINFEAROR
Caesarean section
 Parity1.68 (1.60 to 1.76)1.34 (0.92 to 1.93)0.80 (0.55 to 1.15)1.51 (1.44 to 1.59)* 1.22 (0.84 to 1.78)* 0.81 (0.56 to 1.18)*
 Maternal education1.15 (1.08 to 1.23)1.0 (0.71 to 1.39)0.86 (0.62 to 1.20)1.07 (1.01 to 1.14) 0.97 (0.69 to 1.35) 0.90 (0.65 to 1.25)
LBW
 Parity0.59 (0.56 to 0.63)0.47 (0.31 to 0.71)0.79 (0.53 to 1.19)0.58 (0.55 to 0.61)* 0.43 (0.28 to 0.66)* 0.74 (0.49 to 1.13)*
 Maternal education0.86 (0.80 to 0.92)0.86 (0.64 to 1.17)1.0 (0.75 to 1.35)0.86 (0.80 to 0.92) 0.89 (0.65 to 1.21) 1.03 (0.76 to 1.39)
  • * Adjusted for maternal age, occurrence of previous miscarriages, folic acid intake, alcohol consumption during pregnancy, maternal pregnancy weight gain and maternal education.

  • Adjusted for maternal age, occurrence of previous miscarriages, folic acid intake, alcohol consumption during pregnancy, maternal pregnancy weight gain and parity.

  • LBW, low birth weight; PBR, Piedmont Birth Registry; ROR, relative OR.