Table 3

Crude and adjusted odds ratios (OR) and 95% confidence intervals (CI) of the 493 cases and 493 controls in the study in Southern Iran
Parameter Events Crude OR (95% CI) Adjusted OR (95%CI)1
Cases/Controls
Parity
 Nulliparous 38/12 1 1
 1 – 3 130/76 0.50 (0.25 – 1.02) 0.53 (0.25 – 1.15)
 4 – 6 227/197 0.34 (0.17 – 0.67) 0.47 (0.29 – 0.93)
 7+ 98/208 0.14 (0.07 – 0.28) 0.23 (0.11 – 0.50)
 P for trend < 0.001 < 0.001
Age at menarche (years)
 < 12 42/25 1.80(1.07 – 3.02) 1.72 (0.96 – 3.07)
 12 – 15 395/425 1 1
 > 15 56/43 1.40 (0.91 – 2.13) 1.11 (0.86 – 2.24)
 P for trend 0.75 0.09
Education
 None 179/292 1 1
 Elementary 155/123 2.05 (1.51 – 2.79) 1.33 (0.83 – 2.29)
 High school 108/62 2.84 (1.95 – 4.12) 1.26 (0.78 – 2.03)
 University 51/16 5.19 (2.81 – 9.59) 1.50 (0.64 – 3.48)
 P for trend < 0.001 0.06
Occupation
 Housewife 391/462 1 1
 Employed 102/31 3.88 (2.51 – 5.99) 2.05 (1.15 – 3.92)
Height (cm)2
 ≤ 151 143/132 1 1
 152 – 156 160/122 1.21(0.86 – 1.69) 1.12 (0.77 – 1.62)
 157 – 160 90/163 0.50(0.35 – 0.72) 0.73 (0.49 – 1.71)
 > 160 85/76 1.03(0.69 – 1.52) 1.08 (0.69 – 1.66)
 Missing 15/0
 P for trend 0.06 0.10
BMI (Overall)
 < 18.5 4/14 0.38 (0.12 – 1.19) 0.60 (0.17 – 2.11)
 18.5 – 24.9 129/181 1 1
 25 – 29.9 208/193 1.43 (1.06 – 1.95) 1.39 (1.02 – 1.94)
 ≥ 30 141/119 1.58 (1.12 – 2.22) 1.61 (1.18 – 2.30)
 Missing 15/0
 P for trend <0.001 0.01
BMI (age <58 years)
 < 18.5 4/5 0.90 (0.23 – 3.55) -
 18.5 – 24.9 78/90 1 1
 25 – 29.9 126/123 1.18 (0.79 – 1.74) 1.27 (0.80 – 2.02)
 ≥ 30 89/82 1.25(0.81 – 1.91) 1.21 (0.73 – 1.99)
 P for trend 0.30 0.47
BMI (age ≥58 years)
 < 18.5 0/9 - -
 18.5 – 24.9 47/77 1 1
 25 – 29.9 82/70 1.91 (1.18 – 3.11) 1.56 (0.97 – 2.65)
 ≥ 30 52/37 2.30 (1.32 – 4.01) 2.34 (1.33 – 4.14)
 P for trend 0.002 0.008
 P for interaction3 0.16 0.09
F.H. of breast cancer
 No 422/470 1 1
 Yes 71/23 3.50 (2.37 – 5.17) 2.61 (1.72 – 3.96)
 1st relative 43/15 3.19(1.73 – 5.86) 2.13 (1.20 – 4.46)
 2nd relative 28/8 3.89(1.74 – 8.69) 1.98 (0.96 – 5.62)
 P for trend < 0.001 0.003

(Abbreviation F.H.: Family History).

1Adjusted for all variables in the table in addition to age.

2Height was categorized based on approximate quartile values of the control population.

3Multiplicative interaction between BMI and age.

Ghiasvand et al.

Ghiasvand et al. BMC Cancer 2012 12:414   doi:10.1186/1471-2407-12-414

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