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Table 1 Participant characteristics

From: Is retrospective assessment of health-related quality of life valid?

Sample
(n = 364)
  Participants
(n = 88)
Non-participants
(n = 276)
Age (years) Mean (range) 68 (32–88) 68 (26–91)
Sex Male 43 (49%) (unknown)
Female 45 (51%) (unknown)
First Language English 81 (92%) 203 (74%)
Other than English 7 (8%) 73 (26%)
Procedure Hip replacement 29 (33%) (unknown)
Knee replacement 59 (67%) (unknown)
Dates Median (range) duration between prospective and retrospective dates (days) 15 (3 to 64)