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Table 1 Comparative measurement range of five physical function instruments with 90% reliability

From: Development and assessment of floor and ceiling items for the PROMIS physical function item bank

  PF-10 HAQ PROMIS PF-10 PROMIS PF-20 PROMIS PF CAT-10
Floor -2.5 -4.5 -2.9 -4.5 -4.5
Ceiling -0.2 -0.4 0.2 0.2 1.2
Range 2.3 4.1 3.1 4.8 5.7
  1. Each unit below zero (the population mean) is scored as a negative of standard deviations toward the floor, and each unit above zero (the population mean) is a standard deviation in the direction of the ceiling "range" as the algebraic sum of standard deviations of positive and negative [15]. 1 Instruments: PF-10 - 10-item physical function scale of the SF-36 [3]; HAQ - 20-item Health Assessment Questionnaire [2]; PROMIS PF-10 - PROMIS PF-10, 10-item Physical Function assessment form [5]; PROMIS PF-20 - PROMIS PF-20, 20-item physical function assessment form [5]; PROMIS PF CAT-10 - PROMIS PF 10-item Computerized Assessment Testing [5]