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Table 3 Associations of pre-pregnancy and early pregnancy sedentary time with offspring birth size by offspring sex

From: Maternal sedentary behavior during pre-pregnancy and early pregnancy and mean offspring birth size: a cohort study

Females

Males

 

N

Mean differencea

(95% CI)

 

N

Mean differencea

(95% CI)

Birthweight (g)

Pre-pregnancy sedentary time (hours/day)

Pre-pregnancy sedentary time (hours/day)

 Continuous (hrs)

635

−9.9 (− 29, 9.6)

Continuous (hrs)

738

−14 (− 41, 13)

 Quartile 1 (0.0–1.4)

139

Reference

Quartile 1 (0.0–1.4)

188

Reference

 Quartile 2 (1.5–2.0)

186

−6.8 (− 96, 84)

Quartile 2 (1.5–2.0)

223

− 39 (− 120, 43)

 Quartile 3 (2.1–2.9)

105

−68 (− 175, 39)

Quartile 3 (2.1–2.9)

115

−14 (− 110, 83)

 Quartile 4 (3.0–13)

205

−54 (− 145, 37)

Quartile 4 (3.0–13)

212

−38 (− 124, 48)

 P for trend

 

0.15

P for trend

 

0.52

 P for interaction

 

continuous = 0.37, quartiles = 0.70

  

Early pregnancy sedentary time (hours/day)

Early pregnancy sedentary time (hours/day)

 Continuous (hrs)

705

1.8 (−17, 21)

Continuous (hrs)

830

−1.1 (−22, 20)

 Quartile 1 (0.0–1.5)

190

Reference

Quartile 1 (0.0–1.5)

228

Reference

 Quartile 2 (1.6–2.4)

145

44 (−46, 135)

Quartile 2 (1.6–2.4)

195

−14 (− 88, 61)

 Quartile 3 (2.5–3.1)

195

44 (−44, 132)

Quartile 3 (2.5–3.1)

200

5.7 (−70, 81)

 Quartile 4 (3.2–13)

175

−4.4 (− 96, 88)

Quartile 4 (3.2–13)

207

− 17 (− 102, 68)

 P for trend

 

0.97

P for trend

 

0.81

 P for interaction

 

continuous = 0.45, quartiles = 0.71

  

Head circumference (cm)

Pre-pregnancy sedentary time (hours/day)

Pre-pregnancy sedentary time (hours/day)

 Continuous (hrs)

631

0.0 (−0.04, 0.1)

Continuous (hrs)

731

0.1 (− 0.1, 0.2)

 Quartile 1 (0.0–1.4)

138

Reference

Quartile 1 (0.0–1.4)

185

Reference

 Quartile 2 (1.5–2.0)

184

0.5 (0.02, 0.9)

Quartile 2 (1.5–2.0)

221

0.1 (−0.4, 0.5)

 Quartile 3 (2.1–2.9)

105

0.7 (0.3, 1.2)

Quartile 3 (2.1–2.9)

115

0.5 (− 0.1, 1.1)

 Quartile 4 (3.0–13)

204

0.1 (−0.3, 0.4)

Quartile 4 (3.0–13)

210

0.2 (−0.3, 0.7)

 P for trend

 

0.99

P for trend

 

0.29

 P for interaction

 

continuous = 0.84, quartiles = 0.51

  

Early pregnancy sedentary time (hours/day)

Early pregnancy sedentary time (hours/day)

 Continuous (hrs)

701

0.1 (−0.1, 0.2)

Continuous (hrs)

823

0.0 (−0.1, 0.2)

 Quartile 1 (0.0–1.5)

189

Reference

Quartile 1 (0.0–1.5)

224

Reference

 Quartile 2 (1.6–2.4)

145

0.1 (−0.3, 0.5)

Quartile 2 (1.6–2.4)

193

−0.4 (− 0.9, 0.1)

 Quartile 3 (2.5–3.1)

193

0.3 (−0.1, 0.6)

Quartile 3 (2.5–3.1)

200

0.0 (−0.5, 0.5)

 Quartile 4 (3.2–13)

174

0.1 (−0.3, 0.6)

Quartile 4 (3.2–13)

206

0.0 (−0.6, 0.6)

 P for trend

 

0.45

P for trend

 

0.62

 P for interaction

 

continuous = 0.48, quartiles = 0.34

  

Ponderal index (kg/m 3 ) b

Pre-pregnancy sedentary time (hours/day)

Pre-pregnancy sedentary time (hours/day)

 Continuous (hrs)

691

0.2 (− 0.2, 0.6)

Continuous (hrs)

733

0.0 (−0.3, 0.3)

 Quartile 1 (0.0–1.4)

139

Reference

Quartile 1 (0.0–1.4)

185

Reference

 Quartile 2 (1.5–2.0)

184

0.8 (−0.6, 2.3)

Quartile 2 (1.5–2.0)

222

0.4 (−1.0, 1.8)

 Quartile 3 (2.1–2.9)

104

0.3 (−0.8, 1.4)

Quartile 3 (2.1–2.9)

115

0.7 (−1.2, 2.7)

 Quartile 4 (3.0–13)

204

1.0 (−0.03, 2.1)

Quartile 4 (3.0–13)

211

0.3 (−1.0, 1.6)

 P for trend

 

0.17

P for trend

 

0.64

 P for interaction

 

continuous = 0.45, quartiles = 0.70

  

Early pregnancy sedentary time (hours/day)

Early pregnancy sedentary time (hours/day)

 Continuous (hrs)

700

0.2 (−0.2, 0.6)

Continuous (hrs)

825

−0.1 (− 0.6, 0.4)

 Quartile 1 (0.0–1.5)

190

Reference

Quartile 1 (0.0–1.5)

224

Reference

 Quartile 2 (1.6–2.4)

144

−0.2 (−1.3, 0.9)

Quartile 2 (1.6–2.4)

195

−2.5 (−5.3, 0.4)

 Quartile 3 (2.5–3.1)

192

0.2 (−0.9, 1.3)

Quartile 3 (2.5–3.1)

200

−1.5 (−4.5, 1.4)

 Quartile 4 (3.2–13)

174

0.2 (−1.4, 1.8)

Quartile 4 (3.2–13)

206

−1.5 (− 4.3, 1.3)

 P for trend

 

0.74

P for trend

 

0.38

 P for interaction

 

continuous = 0.35, quartiles = 0.55

  
  1. aModel is adjusted for maternal age (years), white race, nulliparity, pre-pregnancy BMI category (underweight/normal weight/overweight/obese), high school education or more, marital status (married/single), smoking during pregnancy, alcohol use during pregnancy, gestational age at delivery (weeks), and pre-pregnancy moderate/vigorous leisure time physical activity duration (quartiles) for pre-pregnancy sedentary time analyses or early pregnancy moderate/vigorous leisure time physical activity duration (quartiles) for early pregnancy sedentary time analyses
  2. bResults are excluding outliers for ponderal index (> 400 kg/m3)
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