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Table 3 Factors associated with non-left side sleep position (n = 375)

From: Survey of maternal sleep practices in late pregnancy in a multi-ethnic sample in South Auckland, New Zealand

Variable Left side sleep Non-left sleep Univariable OR Adjusted OR
(n = 114) (n = 261) (95% CI) (95% CI)
n (row %) n (row %)   
Maternal age (years) [mean (SD)] 28.6 (5.7) 27.0 (5.4) 0.95 (0.91–0.99)* 0.97 (0.92–1.01)
Ethnicity (prioritised)
 Maori 23 (26.4) 64 (73.6) 2.12 (1.11–4.05)* 2.64 (1.23–5.66)*
 Pacific 43 (27.9) 111 (72.1) 1.96 (1.12–3.45)* 2.91 (1.46–5.78)*
 Asian 13 (24.5) 40 (75.5) 2.34 (1.09–5.03)* 1.79 (0.79–4.05)
 European & Other 35 (43.2) 46 (56.8) Reference Reference
Live with partner
 No 19 (27.1) 51 (72.9) Reference Reference
 Yes 95 (31.2) 210 (68.9) 0.82 (0.46–1.47) 1.36 (0.70–2.65)
Gestational age (weeks) [mean (SD)] 35.3 (3.6) 35.3 (3.4) 1.01 (0.94–1.07) 1.03 (0.96–1.10)
BMI [mean (SD)] 34.9 (7.6) 32.5 (7.1) 0.96 (0.93–0.99)* 0.93 (0.89–0.96)*
Sleeping on left side of bed
 No 43 (20.0) 172 (80.0) 3.19 (2.02–5.04)* 3.29 (2.03–5.32)*
 Yes 71 (44.4) 89 (55.6) Reference Reference
Received any advice on sleep position
 No 36 (30.3) 83 (69.8) 1.01 (0.63–1.62) 0.99 (0.59–1.66)
 Yes 78 (30.5) 178 (69.5) Reference Reference
  1. OR Odds ratio, CI Confidence interval, BMI Body mass index
  2. *Statistically significant (p ≤ 0.05)
  3. Multivariable model is adjusted for all the variables in the table
  4. Maternal age, gestational age, and BMI were treated as continuous variables and ORs are for a 1 unit increase