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Table 1 Study and eligible sample for the radiographic study, stratified in age groups

From: Occupational kneeling and radiographic tibiofemoral and patellofemoral osteoarthritis

 

Floor layers

Graphic designers

 

Study sample

Survey respondents

Knee injury

Eligible sample*

Study participants

Study sample

Survey respondents

Knee injury

Eligible sample*

Study participants

Age group

N

n (%)†

n (%)‡

n (%)

n (%)§

N

n (%)†

n (%)‡

n (%)

n (%)§

≤ 49 years

115

99 (86)

11 (11)

88 (77)

43 (49)

40

33 (83)

4 (12)

29 (73)

7 (24)

50–59 years

111

99 (89)

4 (4)

95 (86)

72 (76)

155

128 (83)

13 (10)

115 (74)

73 (64)

≥ 60 years

60

55 (92)

7 (13)

48 (80)

19 (40)

175

129 (74)

15 (12)

114 (65)

40 (35)

Total

286

253 (89)

22 (9)

231 (81)

134 (58)

370

290 (78)

32 (11)

258 (70)

120 (47)

  1. * Respondents with previous knee injuries excluded
  2. † % of study sample
  3. ‡ % of survey respondents
  4. § % of eligible sample