Table 2. Accelerometer-derived and IPAQ-estimates indices of physical activity and sedentary behaviour.
| Accelerometer-derived vs IPAQ-reported activity measure | Accelerometer | IPAQ | Difference [IPAQ minus accelerometer] | p b | r (95% CI) | Pc (95% CI) |
| (Mean ± SD) | (Mean ± SD) | (Mean (Limits of Agreement)) | ||||
| Sedentary vs. Sitting (min.day−1) | 523.1±90.9 | 454.2±103.1 | −68.8 (−228.3 to 90.8) | <0.0001 | 0.654 (0.570 to 0.738) | 0.519 (0.402 to 0.697) |
| Moderate vs. Moderatea (min.day−1) | 33.7±23.7 | 88.5±63.1 | 54.8 (−55.7 to 165.3) | <0.0001 | 0.458 (0.359 to 0.556) | 0.182 (0.103 to 0.291) |
| Vigorous vs. Vigorous (min.day−1) | 2.6±4.8 | 10.4±9.4 | 7.8 (−10.7 to 26.4) | <0.0001 | 0.259 (0.146 to 0.360) | 0.134 (0.092 to 0.339) |
| MVPA vs. MVPAa (MET.min.day−1) | 155.9±117.9 | 397.8±248.3 | 241.9 (−177.6 to 661.5) | <0.0001 | 0.508 (0.412 to 0.603) | 0.222 (0.126 to 0.367) |
N = 317,
a
moderate and MVPA domains for IPAQ include walking.
b
p-value for comparison between accelerometer and IPAQ mean values.
Limits of Agreement expressed as the mean difference between methods ±1.96×SD. r = Pearson correlation coefficient; Pc = concordance correlation coefficient.