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. Author manuscript; available in PMC: 2012 Sep 4.
Published in final edited form as: Maturitas. 2010 Sep 1;67(4):353–357. doi: 10.1016/j.maturitas.2010.07.014

Table 3.

Associations between different estrogen-related variables and the risk of bladder cancer among Egyptian women

Estrogen-related main predictor variablea Controls All Cases Only SCCb Only UCc

N AORd (95% CIe)f N AOR (95% CI)f N AOR (95% CI)f
Age at first pregnancy (y)
 ≤18 282 87 ref 45 ref 42 ref
 >18 198 121 1.98 (1.41, 2.77) 62 1.98 (1.27, 3.09) 59 1.99 (1.25, 3.18)

Number of pregnancies
 ≤7 257 126 ref 67 ref 59 ref
 >7 236 87 0.66 (0.47, 0.94) 44 0.76 (0.48, 1.20) 43 0.62 (0.39, 0.99)

Menopause
 No 152 21 ref 17 ref 4 ref
 Yes
 At age (y)
  ≥50 160 60 2.71 (1.39, 5.29) 22 2.22 (0.91, 5.44) 38 6.13 (1.86, 20.16)
  45 to 49 109 64 4.06 (2.20, 7.49) 35 4.28 (1.98, 9.24) 29 7.46 (2.35, 23.67)
  <45 72 68 6.26 (3.46, 11.34) 37 5.63 (2.74, 11.57) 31 12.78 (4.05, 40.29)

Oral contraceptive
 No 316 171 ref 89 ref 82 ref
 Yes 168 36 0.44 (0.29, 0.65) 19 0.36 (0.21, 0.63) 19 0.58 (0.33, 1.03)
a

For each main predictor variable, we performed a logistic regression model;

b

squamous cell carcinoma;

c

urothelial [cell] carcinoma;

d

adjusted odds ratio;

e

confidence interval;

f

adjusted for age, residence, history of schistosomiasis, and history of urinary tract infection.