Table 3 Results of KOOS JR instrument. Legend: Comparison of mean scores and standard deviation on the KOOS, JR instrument results before (baseline) and after (follow-up) completing either a list of tasks similar to the items in the KOOS, JR (intervention) or the QuickDASH (control) instrument

(1) Knee stiffness after first wakening

 Intervention

2.4 ± 1.1

2.4 ± 0.9

0.453

 Control

2.3 ± 0.9

2.2 ± 1.0

0.444

 P value

0.524

0.463

-

(2) Twisting/pivoting on your knee

 Intervention

2.9 ± 1.0

2.5 ± 1.1

0.041*

 Control

2.5 ± 0.9

2.4 ± 0.9

0.332

 P value

0.107

0.763

-

(3) Straightening knee fully

 Intervention

2.1 ± 1.0

1.8 ± 1.0

0.131

 Control

2.3 ± 1.0

2.1 ± 1.1

0.303

 P value

0.408

0.218

-

(4) Going up or down stairs

 Intervention

2.9 ± 1.0

2.9 ± 0.9

0.452

 Control

2.7 ± 1.0

2.8 ± 0.9

0.278

 P value

0.394

0.857

-

(5) Standing upright

 Intervention

2.0 ± 1.0

2.1 + 1.0

0.450

 Control

1.9 ± 1.1

2.1 ± 1.2

0.235

 P value

0.701

0.747

-

(6) Rising from sitting

 Intervention

2.7 ± 0.8

2.4 ± 0.8

0.093

 Control

2.1 ± 0.8

2.4 ± 1.1

0.199

 P value

0.014 *

0.904

-

(7) Bending to floor/pick up an object

 Intervention

2.6 ± 0.9

2.3 ± 1.0

0.089

 Control

2.3 ± 1.1

2.3 ± 1.1

0.403

 P value

0.201

0.857

-

(8) Total score (0–28)

 Intervention

17.1 ± 5.9

15.8 ± 5.7

0.171

 Control

16.1 ± 5.6

16.4 ± 6.2

0.409

 P value

0.484

0.672

-

(9) Interval score (0–100)

 Intervention

42.5 ± 14.1

46.3 ± 13.4

0.127

 Control

46.4 ± 14.7

44.8 ± 17.8

0.358

 P value

0.288

0.716