From: Cytochrome P450 1A2 (CYP1A2) activity and risk factors for breast cancer: a cross-sectional study
Variable | β (SE) | F | P | Quartiles (mean CMR [95% confidence interval]) | P for trend | |||
---|---|---|---|---|---|---|---|---|
 |  |  |  | Q1 | Q2 | Q3 | Q4 |  |
Age (years) | -0.012 (0.006) | 4.51 | 0.04 | 7.17 (6.18–8.32) | 6.42 (5.60–7.37) | 6.69 (5.72–7.82) | 5.93 (5.07–6.94) | 0.02 |
Age at first birth (years)2 | 0.02 (0.15) | 0.03 | 0.87 | Â | Â | Â | Â | Â |
Age at menarche (years) | -0.03 (0.02) | 3.97 | 0.05 | 6.75 (5.91–7.72) | 6.96 (5.90–8.20) | 6.69 (5.60–7.98) | 5.75 (4.92–6.73) | 0.04 |
Age at menopause (years) | -0.004 (0.006) | 0.33 | 0.57 | Â | Â | Â | Â | Â |
BMI (kg/m2)2 | -0.45 (0.14) | 0.10 | 0.75 | Â | Â | Â | Â | Â |
WHR | -0.96 (0.42) | 5.19 | 0.02 | 6.69 (5.67–7.91) | 6.83 (5.79–8.05) | 6.39 (5.49–7.43) | 6.04 (5.17–7.05) | 0.17 |
Caffeine (mg/day)1 | -0.003 (0.006) | 0.23 | 0.64 | Â | Â | Â | Â | Â |
Alcohol (kcal/day)2 | -0.02 (0.02) | 1.26 | 0.26 | Â | Â | Â | Â | Â |
Cholesterol (mg/day)2 | 0.02 (0.06) | 0.08 | 0.78 | Â | Â | Â | Â | Â |
Total energy (kcal/day)1 | 0.003 (0.005) | 0.42 | 0.52 | Â | Â | Â | Â | Â |
Carbohydrate (g/day)1 | 0.01 (0.01) | 0.32 | 0.57 | Â | Â | Â | Â | Â |
Fat intake (g/day)1 | 0.02 (0.02) | 1.03 | 0.31 | Â | Â | Â | Â | Â |
Protein intake (g/day)2 | 0.04 (0.09) | 0.20 | 0.66 | Â | Â | Â | Â | Â |
Total estradiol (pmol/l)3 | -0.26 (0.42) | 0.40 | 0.53 | Â | Â | Â | Â | Â |
Free estradiol (%)2 | -0.03 (0.01) | 5.11 | 0.03 | 7.04 (6.03–8.22) | 7.07 (6.04–8.27) | 5.86 (5.05–6.80) | 5.96 (4.97–7.15) | 0.01 |
SHBG (nmol/l)4 | 0.03 (0.02) | 1.80 | 0.18 | 5.96 (4.98–7.14) | 5.69 (4.88–6.63) | 6.98 (5.91–8.24) | 6.55 (5.55–7.72) | 0.08 |
Progesterone, (nmol/l)2 | -0.02 (0.05) | 0.23 | 0.63 | Â | Â | Â | Â | Â |
FSH (IU/l)2 | 0.06 (0.07) | 0.60 | 0.44 | Â | Â | Â | Â | Â |
GH (μg/l)5 | 0.02 (0.02) | 0.57 | 0.45 |  |  |  |  |  |
IGF-1 (ng/ml)6 | 0.85 (0.33) | 6.68 | 0.01 | 6.30 (5.30–7.48) | 6.49 (5.50–7.65) | 6.42 (5.43–7.60) | 7.46 (6.27–8.89) | 0.13 |
IGFBP-3 (mg/l)7 | -0.66 (0.23) | 8.32 | 0.005 | 8.04 (6.82–9.48) | 6.27 (5.29–7.44) | 6.40 (5.46–7.51) | 6.01 (5.11–7.07) | 0.003 |
Insulin (pmol/l)2 | -0.01 (0.08) | 0.01 | 0.92 | Â | Â | Â | Â | Â |
Total cholesterol (mmol/l)2 | -0.35 (0.18) | 3.70 | 0.06 | 6.98 (5.97–8.16) | 6.88 (5.90–8.04) | 6.40 (5.46–7.51) | 6.13 (5.28–7.11) | 0.05 |
LDL-cholesterol (mmol/l)2 | -0.13 (0.13) | 1.00 | 0.32 | Â | Â | Â | Â | Â |
HDL-cholesterol (mmol/l)2 | -0.16 (0.12) | 1.82 | 0.18 | 5.77 (5.02–6.63) | 5.53 (4.83–6.34) | 5.63 (4.89–6.48) | 4.85 (4.17–5.66) | 0.08 |
Triglycerides (mmol/l)2 | -0.12 (0.06) | 3.37 | 0.07 | 6.94 (5.90–8.16) | 6.68 (5.75–7.75) | 6.52 (5.52–7.70) | 6.15 (5.24–7.20) | 0.15 |