Agreement between pedometer and accelerometer in measuring physical activity in overweight and obese pregnant women

Tarja I Kinnunen, Peter W G Tennant, Catherine McParlin, Lucilla Poston, Stephen C Robson, Ruth Bell, Tarja I Kinnunen, Peter W G Tennant, Catherine McParlin, Lucilla Poston, Stephen C Robson, Ruth Bell

Abstract

Background: Inexpensive, reliable objective methods are needed to measure physical activity (PA) in large scale trials. This study compared the number of pedometer step counts with accelerometer data in pregnant women in free-living conditions to assess agreement between these measures.

Methods: Pregnant women (n = 58) with body mass index ≥25 kg/m(2) at median 13 weeks' gestation wore a GT1M Actigraph accelerometer and a Yamax Digi-Walker CW-701 pedometer for four consecutive days. The Spearman rank correlation coefficients were determined between pedometer step counts and various accelerometer measures of PA. Total agreement between accelerometer and pedometer step counts was evaluated by determining the 95% limits of agreement estimated using a regression-based method. Agreement between the monitors in categorising participants as active or inactive was assessed by determining Kappa.

Results: Pedometer step counts correlated moderately (r = 0.36 to 0.54) with most accelerometer measures of PA. Overall step counts recorded by the pedometer and the accelerometer were not significantly different (medians 5961 vs. 5687 steps/day, p = 0.37). However, the 95% limits of agreement ranged from -2690 to 2656 steps/day for the mean step count value (6026 steps/day) and changed substantially over the range of values. Agreement between the monitors in categorising participants to active and inactive varied from moderate to good depending on the criteria adopted.

Conclusions: Despite statistically significant correlations and similar median step counts, the overall agreement between pedometer and accelerometer step counts was poor and varied with activity level. Pedometer and accelerometer steps cannot be used interchangeably in overweight and obese pregnant women.

Figures

Figure 1
Figure 1
Daily step counts measured by accelerometer and pedometer. The figure also shows the line of equality and (least-squares) line of best fit (n = 58).
Figure 2
Figure 2
Differences in step counts/day between accelerometer and pedometer plotted against the mean of both (n = 58). The limits of agreement were calculated using a regression method previously described by Bland & Altman [34]. The formula for the 95% limits of agreement is: [2339-0.391 × (mean of accelerometer and pedometer)] ± 2.46 × [1201-0.019 × (mean of accelerometer and pedometer)].

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