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Table 4 Primary and secondary outcome measures used to assess preliminary effectiveness from baseline (t0) to follow-up (t1) (12 weeks)

From: Usability and preliminary effectiveness of an app-based physical activity and education program for people with hip or knee osteoarthritis – a pilot randomized controlled trial

Outcome

Baseline (t0)

 

Week 12 (t1)

 

Mean Difference (95% CI for Difference)

ES (ƞp2)

p value

Intervention (n = 32)

Control (n = 28)

Intervention (n = 32)

Control (n = 28)

Primary

 HOOS/KOOS paina

62.5 (16.8)

55.9 (23.7)

68.3 (16.1)

55.5 (22.5)

8.52 (1.01 to 16.04)

0.08

0.027*

 HOOS/KOOS ADLb

68.1 (20.2)

64.3 (23.0)

71.8 (14.3)

63.7 (23.9)

5.73 (-1.57 to 13.03)

0.04

0.121

Secondary

 HOOS, KOOS totalc

52.7 (18.0)

50.3 (20.5)

56.0 (13.0)

50.0 (21.4)

4.72 (-1.60 to 11.04)

0.04

0.140

 HOOS/KOOS symptomsc

58.7 (20.1)

54.2 (21.5)

59.3 (17.1)

55.1 (22.1)

0.91 (-5.75 to 7.58)

0.00

0.785

 HOOS/KOOS sportc

39.7 (25.6)

41.6 (29.2)

41.7 (17.6)

35.3 (28.5)

7.16 (-3.55 to 17.86)

0.03

0.186

 HOOS/KOOS QoLc

34.9 (19.0)

35.5 (20.5)

40.4 (13.0)

38.9 (23.4)

1.83 (-6.22 to 9.87)

0.00

0.651

ROM Knee (in °)

n = 22

n = 23

n = 22

n = 23

   

 Flexion

125.0 (13.4)

121.8 (13.7)

126.8 (15.4)

124.3 (11.5)

0.59 (-6.09 to 7.26)

0.00

0.860

 Extension

0.3 (5.7)

-2.8 (8.0)

-3.5 (5.5)

-2.7 (6.7)

-1.69 (-5.35 to 1.96)

0.02

0.355

ROM Hip (in °)

n = 10

n = 5

n = 10

n = 5

   

 Flexion

101.2 (17.1)

109.0 (17.5)

115.5 (9.0)

118.0 (5.7)

-0.92 (-10.22 to 8.39)

0.00

0.834

 Extension

16.5 (6.7)

13.0 (7.6)

17.1 (6.2)

16.6 (6.5)

-1.07 (-8.11 to 5.96)

0.01

0.745

 External Rotation

28.8 (10.4)

24.0 (19.5)

32.7 (9.7)

24.2 (15.3)

5.34 (-3.92 to 14.59)

0.12

0.233

 Internal Rotation

23.0 (13.8)

28.0 (10.4)

24.7 (11.4)

31.2 (18.4)

-4.35 (-20.59 to 11.89)

0.03

0.570

 Abduction

33.0 (11.6)

29.0 (7.4)

32.9 (3.3)

29.4 (11.5)

2.76 (-5.67 to 11.19)

0.04

0.490

Isokinetic Strength Knee

n = 32

n = 28

n = 32

n = 28

   

Extension (60°/sec)

 Peak Torque (Nm)

100.6 (37.6)

100.6 (40.2)

96.4 (26.9)

98.8 (34.6)

-2.49 (-13.58 to 8.60)

0.00

0.655

 Total Work (J)

316.7 (114.3)

305.2 (137.6)

303.1 (91.2)

285.4 (105.8)

11.04 (-23.45 to 45.54)

0.01

0.524

 Avg. Power (W)

56.8 (20.9)

57.8 (28.1)

56.2 (17.2)

55.9 (23.0)

0.90 (-6.30 to 8.09)

0.00

0.803

Extension (120°/sec)

 Peak Torque (Nm)

80.0 (28.0)

79.0 (30.8)

76.5 (20.2)

74.4 (26.8)

1.47 (-6.51 to 9.46)

0.00

0.713

 Total Work (J)

255.8 (87.1)

243.5 (109.4)

221.5 (73.0)

203.4 (82.8)

11.08 (-17.27 to 39.43)

0.01

0.437

 Avg. Power (W)

79.0 (29.9)

80.4 (40.6)

68.6 (24.5)

64.5 (30.5)

4.92 (-5.18 to 15.02)

0.02

0.333

Flexion (60°/sec)

 Peak Torque (Nm)

77.9 (29.1)

69.6 (29.7)

75.7 (22.4)

69.4 (19.8)

1.85 (-5.71 to 9.41)

0.00

0.625

 Total Work (J)

303.5 (119.5)

262.9 (126.0)

289.0 (91.8)

237.5 (79.1)

29.70 (0.21 to 59.19)

0.07

0.048*

 Avg. Power (W)

48.6 (18.8)

44.7 (21.4)

49.8 (16.1)

43.7 (16.4)

3.79 (-1.86 to 9.44)

0.03

0.184

Flexion (120°/sec)

 Peak Torque (Nm)

71.0 (25.5)

65.3 (25.8)

64.4 (19.7)

58.8 (18.8)

3.10 (-3.52 to 9.71)

0.02

0.352

 Total Work (J)

280.5 (99.3)

240.3 (115.1)

219.8 (77.2)

183.5 (69.8)

17.26 (-11.38 to 45.90)

0.03

0.232

 Avg. Power (W)

76.2 (31.3)

69.0 (30.9)

62.9 (24.8)

53.4 (23.0)

5.86 (-3.54 to 15.27)

0.03

0.217

Isometric Strength Hip (kg)

 Flexion

14.1 (4.3)

15.2 (5.4)

20.4 (5.1)

19.5 (4.7)

1.26 (-1.20 to 3.71)

0.02

0.309

 Extension

18.3 (6.9)

20.9 (6.7)

22.1 (7.0)

23.0 (7.2)

0.22 (-3.16 to 3.59)

0.00

0.898

 Abduction

15.7 (4.8)

16.8 (5.5)

17.5 (5.2)

19.1 (5.7)

-1.05 (-3.54 to 1.45)

0.01

0.404

30 Seconds Sit to Stand Test (Rep)

14.5 (3.9)

15.1 (4.8)

16.6 (3.5)

17.5 (6.4)

-0.38 (-2.15 to 1.40)

0.00

0.673

IPAQ (METmin/week)

2941.6 (3049.1)

3123.3 (2468.4)

3135.3 (1836.4)

4517.2 (3398.6)

-1291.93 (-2491.99 to -91.88)

0.08

0.035*

PAM-13 (0–100)

66.9 (11.5)

66.9 (10.7)

70.3 (10.6)

65.7 (11.0)

4.67 (-0.19 to 9.53)

0.06

0.059

  1. CI confidence interval, ES effect size (partial eta squared), ADL activity of daily living, HOOS hip disability and osteoarthritis outcome score, KOOS knee injury and osteoarthritis outcome score, NRS numerical rating scale, QoL Quality of Life, IPAQ International Physical Activity Questionnaire, PAM-13 Patient Activation Measure
  2. *Values in parentheses are SDs
  3. aRanges from 0 to 100; lower scores indicate more pain
  4. bRanges from 0 to 100; lower scores indicate worse function
  5. cRanges from 0 to 100; lower scores indicate more knee problems