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Table 2 Infit and outfit statistics by item

From: Development of a short form and scoring algorithm from the validated actionable bladder symptom screening tool

  Symptom Infit MNSQ1 Outfit MNSQ
Bladder Symptoms Intensity (Separation=9.74; Reliability=0.99) ITEM 9 (Number of times urinated) 1.23 0.79
ITEM 8 (Wake to urinate) 0.98 0.97
ITEM 7 (Need to urinate right away) 0.92 0.89
Impact of Bladder Symptoms Intensity (Separation=3.77; Reliability=0.93) ITEM 16 (Depressed) 2.68 2.57
ITEM 10 (Activities with friends and family affected 0.43 1.13
ITEM 11 (Ability to work affected) 0.52 1.11
ITEM 13 (Embarrassed) 0.64 0.75
ITEM 15 (Worried) 0.42 0.75
ITEM 14 (Frustrated) 0.52 0.7
Bladder Symptoms Frequency (Separation=4.40; Reliability=0.95) ITEM 3(Urinary accidents/leakage) 1.14 1.01
ITEM 1(Urinate right away) 0.94 1.01
Bladder Coping Strategies Frequency (Separation=4.85; Reliability=0.96) ITEM 4 (Use of leakage protection in the day) 1.38 0.96
ITEM 5 (Use of leakage protection at night) 1.23 1.38
ITEM 6 (Limit amount of fluid) 0.78 0.82
ITEM 2 (Make sure know where bathrooms are) 0.67 0.64
  1. 1Infit and outfit statistics compare the actual responses on the survey with responses predicted along the range of OAB severity. Acceptable values range from 0.60 – 1.40 for questions with rating scale response options [18].