Table 3 Correlation coefficients and between-method agreement of moderate to vigorous physical activity (MVPA) measurements derived by the Physical Activity Unit 7 item screener, noncalibrated and calibrated, and the reference method (accelerometer)

 MVPA, min/d (SD)

95.2 (33.2)

97.2 (33.8)

93.4 (32.7)

 MVPA, min/d (SD)

106.5 (77.0)

111.0 (77.2)

102.7 (76.9)

 Between-method difference, min/d (95% CI)^a

11.4 (2.9;19.8)

13.8 (1.5;26.0)

9.3 (−2.5;21.1)

 Proportional agreement, %; (95% CI)^b

118 (107;128)

120 (106;134)

116 (101;131)

 Cronbach alpha

0.76

0.73

0.78

 Regression coefficient^c

0.428 (0.379;0.478)

0.444 (0.367;0.520)

0.414 (0.349;0.479)

 Spearman correlation coefficient

0.31

0.33

0.29

 Intra-class correlation coefficient

0.20

0.24

0.16

 Absolute agreement, %^d

46.7

48.2

45.4

 Gross misclassification, %^e

14.1

14.9

13.5

 Kappa^f

0.24

0.24

0.24

PAU-7S, calibrated

95.2 (33.2)

97.2 (33.8)

93.4 (32.7)

 Between-method difference, min/d (95% CI)^a

0 (−3.3;3.3)

1.3 (−3.4;5.6)

−1.09 (−5.6;3.5)

 Proportional agreement, %; (95% CI)^b

105 (101;109)

106 (100;112)

104 (99;110)

 Regression coefficient^c

1.9*10⁻⁶ (−0.116;0.116)

0.007 (−0.177;0.192)

−0.012 (−0.160;0.137)

 Spearman correlation coefficient

0.62

0.66

0.57

 Intra-class correlation coefficient

0.62

0.66

0.57

 Absolute agreement, %^d

59.2

65.2

54.0

 Gross misclassification, %^e

3.2

1.8

3.7

 Kappa^f

0.50

0.57

0.44