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Table 1 Distributions of selected characteristics by case–control status in Caucasians

From: Genotypes and haplotypes of the methyl-CpG-binding domain 2 modify breast cancer risk dependent upon menopausal status

Variable Cases (n = 393) Controls (n = 436) P
Age at menarche (years)
   <11 23 (5.9) 29 (6.7)  
   11–12 152 (39.2) 168 (38.6)  
   ≥ 12 213 (54.9) 238 (54.7) 0.907
Menopausal status
   Premenopausal 88 (22.4) 146 (33.5)  
   Postmenopausal 305 (77.6) 290 (66.5) 0.000
Age at menopause (years)
   <44 76 (25.8) 91 (32.3)  
   44–49 105 (35.6) 87 (30.9)  
   ≥ 49 114 (38.6) 104 (36.8) 0.202
Lifetime lactation (months)
   0 242 (61.6) 260 (59.6)  
   1–5 50 (12.7) 61 (14.0)  
   6–15 56 (14.3) 59 (13.5)  
   ≥ 15 45 (11.4) 56 (12.9) 0.853
Family history of breast cancer in first-degree relatives
   Yes 94 (24.0) 98 (22.5)  
   No 299 (76.0) 338 (77.5) 0.623
Body mass index (kg/m2)
   <25.0 72 (18.3) 77 (17.7)  
   25.0–29.9 100 (25.5) 110 (25.2)  
   ≥ 30.0 221 (56.2) 249 (57.1 0.960
Fat intake
   Low 120 (31.0) 141 (33.2)  
   Medium 132 (34.1) 143 (33.6)  
   High 135 (34.9) 141 (33.2) 0.786
Cigarette smoking
   Never 169 (43.0) 196 (45.0)  
   Ever 224 (57.0) 239 (55.0) 0.534
Alcohol consumption
   Never 66 (19.2) 64 (16.9)  
   Ever 277 (80.8) 315 (83.1) 0.411
Annual income
   Low 126 (39.0) 125 (33.4)  
   Medium 121 (37.5) 133 (35.6)  
   High 76 (23.5) 116 (31.0) 0.074
Study site
   New Haven County 266 (67.7) 282 (64.7)  
   Tolland County 127 (32.3) 154 (35.3) 0.361
Live births
   0 46 (11.95) 66 (15.46)  
   1–2 200 (51.95) 202 (47.31  
   ≥ 2 139 (36.10) 159 (37.24) 0.252
  1. Note that missing data for each characteristic were excluded from the analyses. Values are expressed as n (%).