Table 15: SF-36 mental health scale Rasch analysis summary Item and Person Infit and Outfit statistics for six waves of data collection.

Wave 1Wave 2Wave 3Wave 4Wave 5Wave 6

PersonsMEAN-.08-.04-.02-.03-.06-.06
S.D..30.28.31.30.29.30
MAX.301.641.38.30.29.30
MIN1.87-3.54-2.992.372.162.12
Infit-MNSQ1.011.011.021.021.021.02
Infit-ZSTD-.30-.40-.30-.30-.30-.20
Outfit-MNSQ1.061.081.061.031.021.01
Outfit-ZSTD-.20-.20-.20-.20-.20-.20
Person separation.53.33.45.36.36.41
Person reliability.2.1.1.1.1.1

ItemsMEAN.00.00.00.00.00.00
S.D.1.171.201.191.131.311.07
MAX1.591.781.751.752.131.67
MIN-1.88-2.04-2.08-2.04-1.94-1.95
Infit-MNSQ1.021.051.021.00.99.98
Infit-ZSTD.10.20-.60-.30-.50-.50
Outfit-MNSQ1.051.071.041.021.011.00
Outfit-ZSTD.10.80.20.10-.10-.30
Item separation95.7789.1283.9877.8568.8959.38
Item reliability1.001.001.001.001.001.00

Notes. Person or item reliability <0.8; Item separation <3.0; Person separation <2.0; values in italic for Infit or Outfit MnSq > 1.34; values underlined for Infit or Outfit MnSq < 0.64.