Smoking status and age at menopause quantified in mean-years
| Age at menopause | ||
|---|---|---|
| N (%) | Mean±SD | |
| Years | ||
| Smoking status | ||
| Never-smoker | ||
| Never-smoker, SHS none | 3710 (4.7) | 49.4±5.8 |
| Never-smoker, SHS | 36 095 (45.9) | 48.8±6.2 |
| Ever smokers | 38 894 (49.4) | 48.3±6.2 |
| Crude model p value | <0.001 | |
| Adjusted p value | <0.001 | |
| Age started smoking (years) | ||
| Never-smoker, SHS none | 3710 (4.7) | 49.4±5.8 |
| Never-smoker, SHS | 36 095 (45.7) | 48.8±6.2 |
| <15 | 2521 (3.2) | 47.6±6.6 |
| 15–19 | 19 591 (24.8) | 48.4±6.1 |
| 20–24 | 12 268 (15.5) | 48.5±6.1 |
| 25–29 | 2596 (3.3) | 48.1±6.6 |
| ≥30 | 2164 (2.7) | 48.2±6.6 |
| Crude model p value | <0.001 | |
| Adjusted p value | <0.001 | |
| Average cigarette/day | ||
| Never-smoker, SHS none | 3710 (4.8) | 49.4±5.8 |
| Never-smoker, SHS | 36 095 (46.7) | 48.8±6.2 |
| <5 | 8764 (11.3) | 48.7±6.2 |
| 5–14 | 11 905 (15.4) | 48.4±6.2 |
| 15–24 | 10 296 (13.3) | 48.2±6.1 |
| ≥25 | 6598 (8.5) | 47.9±6.2 |
| Crude model p value | <0.001 | |
| Adjusted p value | <0.001 | |
| Years smoked before menopause | ||
| Never-smoker, SHS none | 3710 (4.9) | 49.4±5.8 |
| Never-smoker, SHS | 36 095 (47.5) | 48.8±6.1 |
| <5 | 2029 (2.7) | 47.7±7.3 |
| 5–9 | 4227 (5.6) | 47.7±7.3 |
| 10–19 | 10 080 (13.3) | 47.0±7.1 |
| 20–29 | 12 177 (16.0) | 47.8±4.9 |
| 30+ | 7709 (10.1) | 51.9±3.5 |
| Crude model p value | <0.001 | |
| Adjusted p value | <0.001 | |
| Pack-years before menopause | ||
| Never-smoker, SHS none | 3710 (5.0) | 49.4±5.8 |
| Never-smoker, SHS | 36 095 (48.4) | 48.8±6.1 |
| <10 | 14 044 (18.8) | 48.1±6.7 |
| 10 to <20 | 8485 (11.4) | 48.3±6.1 |
| 20 to <30 | 4606 (6.2) | 47.2±5.6 |
| 30 to <40 | 3905 (5.2) | 49.9±5.0 |
| 40+ | 3773 (5.1) | 49.7±4.8 |
| Crude model p value | <0.001 | |
| Adjusted p value | <0.001 | |
Adjusted for age decades, race, education, alcohol use, insecticide exposure, OC use, BMI at 18 years, hard exercise at 18 years, and age at menarche (n=69 183).
BMI, body mass index; OC, oral contraceptive; SHS, secondhand smoke.