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Table 1 Study demographic characteristics of never users and ever users of calcium channel blocking drugs at study baseline

From: Long-term use of calcium channel blocking drugs and breast cancer risk in a prospective cohort of US and Puerto Rican women

  Calcium channel blocker use  
Never used (N = 46,904) Used (N = 3853) p valuea
Age at baseline 54.5 (48.0–61.0) 60.2 (55.0–66.0) <0.0001
Age at menarche 12.7 (12.0–13.0) 12.4 (11.5–13.0) <0.0001
Race    <0.0001
 Non-Hispanic White 39,705 (85) 2748 (71)  
 Non-Hispanic Black 3655 (8) 797 (21)  
 Hispanic 2311 (5) 197 (5)  
 Other 1219 (3) 110 (3)  
 Missing 14 (<1) 0 (<1)  
Body mass index    <0.0001
 <25 18,588 (40) 786 (20)  
 25.0–29.9 14,953 (32) 1166 (30)  
 30.0–34.9 7839 (17) 944 (25)  
 35.0+ 5508 (12) 956 (25)  
 Missing 16 (<1) 1 (<1)  
Menopause status    <0.0001
 Pre menopause 14,254 (30) 461 (12)  
 Post menopause 32,332 (69) 3381 (88)  
 Missing 318 (1) 11 (<1)  
Ever pregnant    <0.0001
 No 5947 (13) 407 (11)  
 Yes 40,935 (87) 3445 (89)  
 Missing 22 (<1) 1 (<1)  
Ever used hormone replacement therapy    <0.0001
 No 26,193 (56) 1532 (40)  
 Yes 20,561 (44) 2313 (60)  
 Don’t know/missing 150 (<1) 8 (<1)  
Ever diagnosed with cancerb    0.0009
 No 44,612 (95) 3613 (94)  
 Yes 2241 (5) 230 (6)  
 Don’t know/missing 51 (<1) 10 (<1)  
Smoking status    <0.0001
 Never smoked 26,441 (56) 2045 (53)  
 Past smoker 16,604 (35) 1487 (39)  
 Current smoker 3845 (8) 318 (8)  
 Don’t know/missing 14 (1) 3 (<1)  
  1. Data presented as mean (interquartile range) of N (%)
  2. aCalculated using chi-square tests and Student’s t tests as appropriate
  3. bCancers other than breast cancer (excluding basal-cell carcinoma)