Table 2 Associations of pre-pregnancy and early pregnancy sedentary time with offspring birth size
| Â | N | Mean differencea (95% CI) | Â | N | Mean differencea (95% CI) |
|---|---|---|---|---|---|
Birthweight (g) | |||||
Pre-pregnancy sedentary time (hours/day) | Early pregnancy sedentary time (hours/day) | ||||
Continuous (hrs) | 1373 | −12 (−28, 4.1) | Continuous (hrs) | 1535 | −0.8 (−15, 13) |
 Quartile 1 (0.0–1.4) | 327 | Reference | Quartile 1 (0.0–1.5) | 418 | Reference |
 Quartile 2 (1.5–2.0) | 409 | −29 (−90, 31) | Quartile 2 (1.6–2.4) | 340 | 11 (−48, 69) |
 Quartile 3 (2.1–2.9) | 220 | −46 (− 119, 26) | Quartile 3 (2.5–3.1) | 395 | 16 (−42, 75) |
 Quartile 4 (3.0–13) | 417 | −51 (− 114, 11) | Quartile 4 (3.2–13) | 382 | −18 (−80, 44) |
 P for trend |  | 0.11 | P for trend |  | 0.64 |
Head circumference (cm) | |||||
Pre-pregnancy sedentary time (hours/day) | Early pregnancy sedentary time (hours/day) | ||||
 Continuous (hrs) | 1362 | 0.0 (−0.04, 0.1) | Continuous (hrs) | 1524 | 0.1 (−0.03, 0.2) |
 Quartile 1 (0.0–1.4) | 323 | Reference | Quartile 1 (0.0–1.5) | 413 | Reference |
 Quartile 2 (1.5–2.0) | 405 | 0.2 (−0.1, 0.6) | Quartile 2 (1.6–2.4) | 338 | −0.2 (− 0.5, 0.1) |
 Quartile 3 (2.1–2.9) | 220 | 0.6 (0.2, 0.9) | Quartile 3 (2.5–3.1) | 393 | 0.1 (−0.2, 0.4) |
 Quartile 4 (3.0–13) | 414 | 0.1 (−0.2, 0.4) | Quartile 4 (3.2–13) | 380 | 0.1 (−0.3, 0.5) |
 P for trend |  | 0.45 | P for trend |  | 0.40 |
Ponderal index (kg/m 3 ) b | |||||
Pre-pregnancy sedentary time (hours/day) | Early pregnancy sedentary time (hours/day) | ||||
 Continuous (hrs) | 1364 | 0.1 (− 0.2, 0.4) | Continuous (hrs) | 1525 | 0.0 (− 0.3, 0.4) |
 Quartile 1 (0.0–1.4) | 324 | Reference | Quartile 1 (0.0–1.5) | 414 | Reference |
 Quartile 2 (1.5–2.0) | 406 | 0.6 (−0.5, 1.6) | Quartile 2 (1.6–2.4) | 339 | −1.5 (−3.1, 0.2) |
 Quartile 3 (2.1–2.9) | 219 | 0.5 (−0.7, 1.7) | Quartile 3 (2.5–3.1) | 392 | −0.8 (−2.5, 0.8) |
 Quartile 4 (3.0–13) | 415 | 0.6 (−0.2, 1.5) | Quartile 4 (3.2–13) | 380 | −0.7 (− 2.5, 1.0) |
 P for trend |  | 0.25 | P for trend |  | 0.53 |