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Table 3 Results of linear regression analysis (unadjusted and adjusted) for the relationship between patterns of oral contraceptive use and IGF-1 levels (ng/ml) for women aged 18 to 21 years.

From: A cross-sectional study of different patterns of oral contraceptive use among premenopausal women and circulating IGF-1: implications for disease risk

    Unadjusted Adjusteda
  No. Mean (SD) Beta 95%CI P Beta 95%CI P
OC Use         
Never 100 336.8 (111.5) Reference 0.002 Reference 0.0004
Ever 80 288.7 (87.6) -48.1 -78.2, -18.0   -57.2 -88.7, -25.8  
Never 100 336.8 (111.5) Reference 0.007 Reference 0.002
Past 29 295.6 (82.8) -41.2 -83.6, 1.2   -51.7 -94.6, -8.8  
Current 51 284.7 (90.8) -52.1 -86.6, -17.5   -60.2 -95.5, -24.9  
Ever Users         
Age at first use         
10 to 15 years 11 316.6 (103.4) 43.1 -23.2, 109.3 0.44 34.2 -36.7, 105.0 0.61
16 to 18 years 50 288.3 (87.9) 14.7 -32.4, 61.8   17.4 -44.7, 54.1  
19 to 21 years 19 273.6 (77.2) Reference   Reference  
Time since last use         
Current 51 284.7 (90.8) Reference 0.67 Reference 0.60
< 1 year 11 310.6 (29.3) 25.9 -32.5, 84.3   28.7 -30.0, 87.4  
1 year 18 286.4 (102.7) 1.7 -46.5, 49.9   -1.7 -50.8, 47.5  
Total duration of use         
< 1 year 12 273.6 (78.8) -14.8 -76.3, 46.6 0.80 -11.8 -77.3, 53.7 0.82
1 to 2 years 42 293.2 (86.7) 4.7 -39.2, 48.7   7.0 -37.6, 51.6  
>2 years 26 288.4 (95.1) Reference   Reference  
  1. a Adjusted for age (18 vs. 19 to 21) and ethnicity (East Asian, South Asian, Other/Mixed vs. European)