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Table 1 Mean value, standard deviation (SD) and range for the unilateral and bilateral popliteal angle tests

From: Interrater reliability for unilateral and bilateral tests to measure the popliteal angle in children and youth with cerebral palsy

GMFCS level (n) Type of test Examiner Mean SD Range
I (17) Unilateral 1 27.35 10.1 10–50
2 25.59 10.66 10–50
Bilateral 1 13.53 10.5 0–35
2 13.38 9.68 0–35
II (31) Unilateral 1 33.31 10.69 15–65
2 31.86 9.83 15–50
Bilateral 1 16.21 9.9 0–35
2 14.92 10.49 0–35
III (12) Unilateral 1 33.96 7.65 20–50
2 32.5 8.66 20–50
Bilateral 1 17.71 8.36 0–35
2 17.50 8.26 0–35
IV (10) Unilateral 1 32.0 10.12 15–55
2 32.75 11.99 20–60
Bilateral 1 14.75 7.86 0–25
2 17.75 15.96 0–60
  1. Popliteal angles of the two examiners presented separately for each level of the Gross Motor Function Classification System (GMFCS)