Mother‐reported sleep, accelerometer‐estimated sleep and weight status in Mexican American children: sleep duration is associated with increased adiposity and risk for overweight/obese status
We know of no studies comparing parent‐reported sleep with accelerometer‐estimated sleep in their relation to paediatric adiposity. We examined: (i) the reliability of mother‐reported sleep compared with accelerometer‐estimated sleep; and (ii) the relationship between both sleep measures and child adiposity. The current cross‐sectional study included 303 Mexican American mother–child pairs recruited from Kaiser Permanente Northern California. We measured sleep duration using maternal report and accelerometry and child anthropometrics. Concordance between sleep measures was evaluated using the Bland–Altman method. We conducted zero‐ordered correlations between mother‐reported sleep, accelerometer‐estimated sleep and child BMI z‐scores (BMIz). Using linear regression, we examined three models to assess child BMIz with mother‐reported sleep (model 1), accelerometer‐estimated sleep (model 2) and both sleep measures (model 3). Children had an average age of 8.86 years (SD = 0.82). Mothers reported that their child slept 9.81 ± 0.74 h [95% confidence interval (CI): 9.72, 9.89], compared to 9.58 ± 0.71 h (95% CI: 9.50, 9.66) based on accelerometry. Mother‐reported sleep and accelerometer‐estimated sleep were correlated (r = 0.33, P < 0.001). BMIz outcomes were associated negatively with mother‐reported sleep duration (model 1: β = −0.13; P = 0.02) and accelerometer‐estimated sleep duration (model 2: β = −0.17; P < 0.01). Accounting for both sleep measures, only accelerometer‐measured sleep was related to BMIz (model 3: β = −0.14, P = 0.02). Each sleep measure was related significantly to adiposity, independent of covariates. Accelerometry appeared to be a more reliable measure of children's sleep than maternal report, yet maternal report may be sufficient to examine the sleep–adiposity relationship when resources are limited.
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