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Table 3 Comparison of the counts-per-minute for the waist and wrist placement for all workplaces and tasks

From: Concurrent and discriminant validity of ActiGraph waist and wrist cut-points to measure sedentary behaviour, activity level, and posture in office work

Tasks

  

Workplaces

Task Effects

ConvChair

ActiveChair

Standing

Overall

Overall

vs. Keyboard

vs. Deskwork

vs. Sorting

Mouse

waist VA

0 [0–0]

29 [4–81]

5 [0–14]

14 [4–35]

 

1.000

0.001 (0.59)

0.000 (0.85)

waist VM

0 [0–1]

457 [268–874]

6 [0–32]

158 [101–301]

 

0.271

0.000 (0.29)

0.000 (0.75)

wrist VM

8 [0–161]

22 [6–74]

51 [6–99]

32 [12–153]

 

0.114

0.000 (0.87)

0.000 (0.87)

Keyboard

waist VA

0 [0–0]

17 [4–65]

3 [0–7]

10 [4–33]

 

–

0.002 (0.62)

0.000 (0.81)

waist VM

0 [0–1]

216 [169–438]

4 [0–24]

78 [66–150]

 

–

0.000 (0.57)

0.000 (0.84)

wrist VM

166 [122–314]

174 [128–362]

159 [98–402]

195 [139–344]

 

–

0.000 (0.87)

0.000 (0.87)

Deskwork

waist VA

4 [2–9]

78 [43–239]

31 [19–50]

51 [38–94]

  

–

0.000 (0.85)

waist VM

8 [4–14]

468 [239–657]

44 [25–94]

174 [103–266]

  

–

0.000 (0.84)

wrist VM

2′427 [1′972–2′620]

2′331 [1′997–2′484]

2′445 [2′137–2′811]

2′393 [2′220–2′629]

  

–

0.000 (0.87)

Sorting

waist VA

221 [141–331]

375 [249–555]

424 [354–567]

356 [289–480]

   

–

waist VM

407 [269–520]

929 [662–1′463]

754 [556–809]

707 [585–868]

   

–

wrist VM

7′744 [7′058–8′003]

7′664 [7′139–8′281]

7′899 [7′113–8′274]

7′778 [7′048–8′216]

   

–

Overall

waist VA

59 [36–88]

150 [117–243]

113 [101–176]

120 [93–157]

0.000

   

waist VM

109 [69–139]

631 [443–835]

210 [158–239]

321 [246–448]

0.000

   

wrist VM

2′625 [2′466–2′806]

2′563 [2′440–2′882]

2′736 [2′481–2′905]

2′658 [2′414–2′866]

0.000

   
  

Workplace Effects

       

Overall

waist VA

   

0.000

    

waist VM

   

0.000

    

wrist VM

   

0.742

    

vs. ActiveChair

waist VA

0.003 (0.67)

–

      

waist VM

0.000 (0.86)

–

      

wrist VM

N/A

–

      

vs. Standing

waist VA

0.000 (0.63)

0.007 (0.34)

–

     

waist VM

0.000 (0.66)

0.000 (0.74)

–

     

wrist VM

N/A

N/A

–

     
  1. Counts-per-minute as median with 95% confidence interval. Significant p-values marked in bold, effect sizes given in brackets (task effects on the right side of the table, workplace effects on the lower side of the table)
  2. The Generalised Estimation Equations used the exchangeable working correlation structure and the robust covariance matrix for a negative binomial distribution with log link function. A goodness of fit of 909.9 (waist VA), 798.2 (waist VM), and 647.6 (wrist VM) was observed (QICC values). Abbreviations: Conventional chair (ConvChair), activity-promoting chair (Active Chair), vertical axis (VA), vector magnitude (VM), not applicable (N/A, due to lack of a significant overall effect)