Table 2.

Key characteristics of individuals included in this study [mean (SD) or n (%)]

Cases used for case–control study (n = 278)Controls used for case–control study (n = 3,552)Pa (cases controls comparison)Association with MIP P value (effect direction)Association with VPD P value (effect direction)Association with APD P value (effect direction)
Ageb58 (9.341)53 (9.189)1.3 × 10−181.8 × 10−6 (−)5.8 × 10−95 (−)1.2 × 10−91 (−)
BMI26.231 (4.530)25.337 (4.282)0.00133.3 × 10−19 (+)8.2 × 10−232 (−)1.0 × 10−218 (−)
Postmenopausal0.20740.02831.2 × 10−157.8 × 10−16
 No90(32)1,770 (50)
 Yes188 (68)1,782 (50)
HRT use0.01540.99900.81790.9598
 Never192(69)2,575 (73)
 Past67(24)794 (22)
 Current19(7)183 (5)
Parity and age at first birth0.26600.65402.2 × 10−40.9362
 Nulliparous31(11)481 (14)
 Parity ≤2 and age at first birth ≤2567 (24)778 (22)
 Parity ≤2 and age at first birth >25117 (42)1,413 (40)
 Parity >2 and age at first birth ≤2544 (16)511 (14)
 Parity >2 and age at first birth >2519 (7)369 (10)
MIP (processed)3.088 (0.969)3.414 (0.998)9.3 × 10−61.1 × 10−100 (−)1.9 × 10−85 (−)
VPD (raw)2.025(0.507)2.038 (0.549)0.00461.1 × 10−100 (−)<1.2 × 10−300 (+)
APD (processed)4.386 (0.963)4.424 (1.003)0.00031.9 × 10−85 (−)<1.2 × 10−300 (+)
  • aP values are those of the Wald test (logistic regression, unadjusted) or of LR tests for menopausal status, HRT use, and parity.

  • bFor age and BMI rows, the tests' P values were obtained after adjusting for machine type, else the P values were obtained after adjusting for age, BMI, and machine type.