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Association between early life factors and smoking and caffeine consumption at baseline in the HPFS
| Exposure variable | Pack-years of smoking | Daily caffeine consumption (mg) |
|---|---|---|
| Birthweight | ||
| <5.5 lbs | 12.8 | 229 |
| 5.5–8.4 | 12.6 | 224 |
| 8.5–9.9 lbs | 13.9 | 230 |
| 10+ lbs | 15.1 | 249 |
| Season of birth | ||
| Spring (March–May) | 13.2 | 226 |
| Summer (June–August) | 13.5 | 225 |
| Fall (September–November) | 13.9 | 233 |
| Winter (December–February) | 14.0 | 225 |
| Handedness | ||
| Left | 12.9 | 234 |
| Right | 13.1 | 227 |
