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Table 6 Summaries of person fit

From: Psychometric evaluation, using Rasch analysis, of the WHOQOL-BREF in heroin-dependent people undergoing methadone maintenance treatment: further item validation

 

Mean (SD)

Range

n(%) [infit/outfit > 1.4]

Physical

   

Infit

1.00 (0.73)a

0.08-3.73a

56 (23.7%)

Outfit

1.02 (0.76)a

0.07-3.96a

60 (25.4%)

Psychological

   

Infit

1.01 (0.91)

0.05-7.37

50 (21.2%)

Outfit

1.00 (0.91)

0.05-7.18

50 (21.2%)

Socialb

   

Infit

0.92 (1.18)

0.03-6.62

42 (17.8%)

Outfit

0.93 (1.24)

0.03-7.65

48 (20.3%)

Environment

   

Infit

0.98 (0.79)c

0.10-5.60c

50 (21.2%)

Outfit

0.98 (0.78)c

0.08-5.43c

51 (21.6%)

  1. aParticipants with maximum extreme score were not included (n = 3).
  2. bParticipants with maximum extreme score (n = 2) or minimum extreme score (n = 1) were not included.
  3. cParticipants with maximum extreme score were not included (n = 1).