Table 2

Predictors of specialist diagnosis of atopic dermatitis according to birth factors (Cox's regression analysis) in first study

UnadjustedAdjusted
Independent variableNo of subjects (n=7862)No with diagnosis (n=403)Relative risk (95% CI)P valueRelative risk (95%CI)P value
Sex of child:0.310.40
 Boy40701991.001.00
 Girl37922041.11 (0.91 to 1.34)1.09 (0.89 to 1.32)
Mother's age at childbirth (years):0.860.34
 ≤2420991011.001.00
 25-2932291651.05 (0.82 to 1.35)1.08 (0.84 to 1.39)
 30-3419201121.19 (0.91 to 1.56)1.30 (0.98 to 1.72)
 ≥35614250.82 (0.53 to 1.27)1.06 (0.67 to 1.69)
Parity:< 0.01< 0.01
 140902241.001.00
 227211410.92 (0.74 to 1.13)0.86 (0.69 to 1.07)
 3802340.74 (0.52 to 1.07)0.69 (0.47 to 1.01)
 ≥424940.28 (0.10 to 0.75)0.26 (0.10 to 0.73)
Gestational age (weeks):0.020.02
 ≤36306130.99 (0.57 to 1.74)0.98 (0.56 to 1.71)
 37-38889380.91 (0.64 to 1.28)0.91 (0.64 to 1.29)
 39-4042302011.001.00
 ≥4124101511.34 (1.08 to 1.65)1.32 (1.06 to 1.63)
Difference from expected birth weight (g)§:0.510.35
 ≤−500906410.82 (0.58 to 1.16)0.82 (0.58 to 1.15)
 −499 to −2001630780.87 (0.66 to 1.14)0.86 (0.65 to 1.13)
 −199 to 19928211541.001.00
 200 to 4991487760.92 (0.70 to 1.21)0.94 (0.71 to 1.23)
 ≥500987540.98 (0.72 to 1.33)1.02 (0.74 to 1.39)
  • *Adjusted for other variables in table.

  • †Trend test (Cox's regression of ungrouped variables) when applicable.

  • ‡Missing for 27 control subjects.

  • §Missing for 31 control subjects.