Table 1 Spearman's rank correlation coefficients [95% confidence intervals] between the true full-shift exposure value M and the bias B, and between M and the sample standard deviation s y , for each of the seven sampling durations (5, 10, 20, 40, 60, 120, 240 min) and each of the four posture variables (10th, 50th, 90th percentiles, 10th-90th percentile range)
From: Bias and imprecision in posture percentile variables estimated from short exposure samples
Posture variable: | 10th percentile | 50th percentile | 90th percentile | 10th-90th percentile range | |
|---|---|---|---|---|---|
Mvs B | Â | Â | Â | Â | Â |
Sampling duration, minutes | 5 | 0.64 [0.48;0.76] | 0.02 [-0.21;0.25] | -0.65 [-0.76; -0.49] | -0.66 [-0.77; -0.51] |
| Â | 10 | 0.61 [0.45;0.74] | 0.03 [-0.20;0.26] | -0.49 [-0.65; -0.29] | -0.58 [-0.71; -0.40] |
| Â | 20 | 0.56 [0.38;0.70] | 0.08 [-0.15;0.31] | -0.27 [-0.47; -0.04] | -0.42 [-0.59; -0.21] |
| Â | 40 | 0.53 [0.34;0.68] | 0.30 [0.07;0.49] | -0.17 [-0.38;0.06] | -0.28 [-0.48;-0.06] |
| Â | 60 | 0.56 [0.38;0.70] | 0.28 [0.05;0.48] | -0.10 [-0.32;0.14] | -0.19 [-0.40;0.04] |
| Â | 120 | 0.57 [0.39;0.70] | 0.36 [0.15;0.55] | -0.02 [-0.25;0.21] | -0.07 [-0.29;0.17] |
| Â | 240 | 0.44 [0.23;0.61] | 0.43 [0.23;0.60] | 0.09 [-0.14;0.32] | 0.01 [-0.22;0.24] |
M vs s y | Â | Â | Â | Â | Â |
Sampling duration, minutes | 5 | 0.70 [0.56;0.80] | 0.65 [0.50;0.77] | 0.77 [0.65;0.85] | 0.67 [0.52;0.78] |
| Â | 10 | 0.70 [0.56;0.80] | 0.66 [0.51;0.77] | 0.73 [0.60;0.82] | 0.62 [0.46;0.75] |
| Â | 20 | 0.72 [0.58;0.81] | 0.59 [0.42;0.72] | 0.71 [0.57;0.81] | 0.60 [0.43;0.73] |
| Â | 40 | 0.68 [0.54;0.79] | 0.53 [0.34;0.68] | 0.72 [0.58;0.81] | 0.63 [0.46;0.75] |
| Â | 60 | 0.66 [0.51;0.77] | 0.52 [0.32;0.67] | 0.70 [0.57;0.80] | 0.63 [0.47;0.75] |
| Â | 120 | 0.64 [0.48;0.76] | 0.47 [0.27;0.63] | 0.67 [0.52;0.78] | 0.55 [0.37;0.70] |
| Â | 240 | 0.57 [0.39;0.71] | 0.40 [0.19;0.58] | 0.44 [0.23;0.61] | 0.36 [0.15;0.55] |