Table 2.
Physical activity (PA) measures during pregnancy (N =197, with 591 observations across three trimesters).
| Variables (Unit: Minutes/Week) |
M (SD) | Medium (IQR) a | Range | For Those Engaging in PA (i) p Value |
None vs Any PA Engagement (ii) p Value |
|---|---|---|---|---|---|
| Accelerometer-based (iii) | |||||
| Light PA | |||||
| 1st trimester | 1469 (429.5) | - | 546–2875 | Reference | - |
| 2nd trimester | 1481 (416.7) | - | 651–2806 | 0.196 | - |
| 3rd trimester | 1463 (395.4) | - | 666–2972 | 0.290 | - |
| MVPA | |||||
| 1st trimester | 177 (113.5) | 167 (137) b | 2–604 | Reference | - |
| 2nd trimester | 168 (116.4) | 148 (118) | 1–806 | 0.430 | - |
| 3rd trimester | 153 (110.5) | 130 (147) | 1–584 | 0.009 | - |
| Total PA | |||||
| 1st trimester | 1646 (467.3) | - | 551–3031 | Reference | - |
| 2nd trimester | 1649 (436.5) | - | 695–2963 | 0.331 | - |
| 3rd trimester | 1616 (426.3) | - | 670–3154 | 0.802 | - |
| Self-reported | |||||
| Walking | |||||
| 1st trimester | 660 (752.0) | 410 (660) | 0–4620 | Reference | Reference |
| 2nd trimester | 717 (720.4) | 450 (820) | 0–4410 | 0.466 | 0.176 |
| 3rd trimester | 633 (648.3) | 420 (660) | 0–3780 | 0.284 | 0.027 |
| Non-walking MPA | |||||
| 1st trimester | 148 (243.0) | 30 (200) | 0–1200 | Reference | Reference |
| 2nd trimester | 215 (361.6) | 70 (240) | 0–2050 | 0.085 | 0.062 |
| 3rd trimester | 173 (285.9) | 60 (200) | 0–1600 | 0.456 | 0.541 |
| Total MPA (walking plus non-walking MPA) | |||||
| 1st trimester | 808 (824.7) | 500 (955) | 0–5220 | Reference | - |
| 2nd trimester | 931 (860.4) | 610 (1070) | 0–4590 | 0.146 | - |
| 3rd trimester | 805 (726.7) | 570 (870) | 0–3790 | 0.971 | - |
| Total MVPA | |||||
| 1st trimester | 818 (835.0) | 500 (955) | 0–5520 | Reference | - |
| 2nd trimester | 951 (888.0) | 610 (1090) | 0–5220 | 0.127 | - |
| 3rd trimester | 811 (730.3) | 570 (860) | 0–3790 | 0.923 | - |
Notes: M = mean; SD = standard deviation; IQR = interquartile range; PA = physical activity; MPA = moderate physical activity; MVPA = moderate-to-vigorous physical activity. ‘-’ indicates not applicable. a computed for those with skewness >|1.0|; b not skewed but computed for the purpose of comparison with other trimester subgroups. (i) Based on generalised linear models with gamma variance and logarithmic link function (for accelerometer-based), negative binominal models (for self-reported, except walking and non-walking MPA), and zero-inflated negative binominal models (for walking and non-walking MPA); (ii) Only applicable to zero-inflated negative binominal models; (iii) Adjusted for wear time.