Table 3.
SED and activity across pregnancy by randomized group (ITT, n = 49)
| 1st trimester (baseline) | 2nd trimester (follow-up) | 3rd trimester (follow-up) | βintervention (SE) | P-value | |
|---|---|---|---|---|---|
| SED | |||||
| SED total, hr/day | |||||
| Intervention | 10.42 (0.28) | 9.69 (0.29) | 9.62 (0.29) | -0.84 (0.36) | 0.019 |
| Control | 10.52 (0.40) | 10.66 (0.37) | 10.38 (0.34) | ref. | |
| SED30, hr/day | |||||
| Intervention | 6.34 (0.36) | 5.30 (0.37) | 5.20 (0.42) | -0.99 (0.40) | 0.014 |
| Control | 5.98 (0.61) | 5.96 (0.62) | 5.91 (0.61) | ref. | |
| SED60, hr/day | |||||
| Intervention | 3.82 (0.39) | 2.56 (0.32) | 2.44 (0.41) | -1.05 (0.39) | 0.008 |
| Control | 3.26 (0.59) | 3.30 (0.61) | 2.95 (0.55) | ref. | |
| Activity | |||||
| Standing, hr/day | |||||
| Intervention | 2.79 (0.20) | 3.43 (0.26) | 3.81 (0.26) | 0.77 (0.26) | 0.003 |
| Control | 2.74 (0.29) | 2.80 (0.28) | 2.81 (0.31) | ref. | |
| Stepping, hr/day | |||||
| Intervention | 1.14 (0.09) | 1.50 (0.11) | 1.48 (0.13) | 0.20 (0.13) | 0.132 |
| Control | 1.38 (0.18) | 1.46 (0.17) | 1.41 (0.19) | ref. | |
| Stepping75, min/day | |||||
| Intervention | 16.17 (2.84) | 22.84 (3.83) | 21.16 (3.79) | 2.61 (3.78) | 0.491 |
| Control | 18.47 (3.87) | 21.40 (5.05) | 21.33 (4.18) | ref. | |
| Stepping100, min/day | |||||
| Intervention | 9.76 (2.22) | 12.82 (2.45) | 10.18 (2.39) | -0.79 (2.41) | 0.745 |
| Control | 10.55 (3.02) | 12.10 (3.86) | 13.13 (3.18) | ref. | |
| Steps per day | |||||
| Intervention | 5224 (502) | 6929 (553) | 6777 (656) | 710 (627) | 0.257 |
| Control | 6268 (895) | 6775 (913) | 6479 (919) | ref. | |
Visit-specific values are reported as mean (SE) and βintervention corresponds to the difference between the intervention and control group at both follow-up visits, adjusting for baseline levels, and with multiple imputation, from a linear mixed model. The ITT analysis excludes n = 2 participants who lost their pregnancies after randomization
Abbreviations: hr/day Hours per day, ITT Intention-to-treat, SE Standard error, SED Sedentary behavior, SED30 Sedentary behavior accumulated in bouts of at least 30 min, SED60 Sedentary behavior accumulated in bouts of at least 60 min, stepping75 Daily duration of time spent stepping at a rate of at least 75 per minute, stepping100 Daily duration of time spent stepping at a rate of least 100 per minute