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Table 1 Baseline characteristics of participants. Values are mean (SD) unless otherwise indicated

From: HAPPi Kneecaps! A double-blind, randomised, parallel group superiority trial investigating the effects of sHoe inserts for adolescents with patellofemoral PaIn: phase II feasibility study

Characteristics Contoured foot orthoses (n = 17) Flat shoe insoles (n = 19) Total (N = 36)
Age (years), median [IQR] 14 [5] 17 [3] 15 [4]
Number (%) of females 12 (71) 15 (79) 27 (75)
Height (cm) 165 (9) 169 (12) 167 (10)
Body mass (kg) 58.5 (12.1) 60.8 (14.4) 59.7 (13.3)
Number (%) with bilateral knee pain 11 (65) 10 (53) 21 (58)
Duration of knee pain months, median [IQR] 9 [38] 24 [18] 18.5 [29.5]
Average pain severity^, median [IQR] 50 [24] 50 [40] 50 [34]
Worst pain severity^, median [IQR] 70 [32] 70 [37] 70 [21]
Most painful activity in the last week, count (%):
 squatting 5 (29) 6 (32) 11 (30.5)
 running 6 (35) 5 (26) 11 (30.5)
 walking upstairs 4 (24) 4 (21) 8 (22)
 walking downstairs 2 (12) 1 (5) 3 (8)
 walking 0 (0) 2 (11) 2 (6)
 jumping 0 (0) 1 (5) 1 (3)
  1. ^Measured on a 100 mm visual analogue scale (0 = no pain, 100 mm = worst pain imaginable), during their nominated most aggravating activity in the past week
  2. IQR interquartile range