Skip to main content

Table 1 Item content and parameters.

From: Practical methods for dealing with 'not applicable' item responses in the AMC Linear Disability Score project

  Estimates of the item parameters ()
Item description Hot deck 1st run Cold deck Items never offered Including tendency to respond Mean 5 runs hot deck
Running for more than 15 minutes (++) (2) 3.77 (0.242) 3.49 (0.238) 3.71 (0.242) 3.72 (-) 3.76 (0.242)
Going for a walk in the woods (2) -1.17 (0.125) -1.02 (0.120) -1.15 (0.124) -1.16 (-) -1.16 (0.125)
Running for less than 5 minutes (3) 1.37 (0.135) 1.26 (0.129) 1.34 (0.135) 1.34 (-) 1.36 (0.135)
Walking up a hill or high bridge (++) (3) -2.54 (0.163) -2.27 (0.156) -2.50 (0.162) -2.51 (-) -2.53 (0.163)
Lifting up a toddler (3) -1.91 (0.140) -1.69 (0.134) -1.87 (0.139) -1.88 (-) -1.90 (0.140)
Moving a bed or table (4) -2.49 (0.160) -2.20 (0.153) -2.44 (0.160) -2.44 (-) -2.47 (0.160)
Playing with a child on the floor (5) -1.84 (0.137) -1.62 (0.132) -1.82 (0.138) -1.83 (-) -1.84 (0.138)
Tightening a screw (+) (5) -3.23 (0.204) -2.82 (0.188) -3.18 (0.204) -3.18 (-) -3.21 (0.204)
Going shopping for clothes (++) (6) -3.11 (0.195) -2.69 (0.179) -3.05 (0.195) -3.06 (-) -3.10 (0.195)
Change a light bulb in a ceiling lamp (7) -1.57 (0.131) -1.37 (0.126) -1.59 (0.132) -1.59 (-) -1.59 (0.132)
Mopping the floor (++) (11) -3.56 (0.231) -2.89 (0.193) -3.55 (0.236) -3.55 (-) -3.56 (0.233)
Putting the rubbish out (12) -3.45 (0.222) -2.82 (0.188) -3.47 (0.231) -3.47 (-) -3.47 (0.224)
Lifting a box weighting 10 kg (13) -1.37 (0.128) -1.11 (0.121) -1.35 (0.129) -1.36 (-) -1.36 (0.128)
Shopping for groceries for a week (13) 0.03 (0.120) 0.15 (0.115) 0.03 (0.122) 0.03 (-) 0.01 (0.120)
Painting a ceiling (14) 1.21 (0.132) 1.17 (0.127) 1.18 (0.134) 1.19 (-) 1.19 (0.132)
Cleaning a bathroom (17) -1.99 (0.142) -1.57 (0.131) -1.98 (0.144) -1.99 (-) -2.00 (0.142)
Carrying a heavy bag upstairs (17) -0.53 (0.120) -0.31 (0.114) -0.47 (0.122) -0.48 (-) -0.49 (0.121)
Painting a wall (18) -0.29 (0.120) -0.08 (0.114) -0.25 (0.122) -0.25 (-) -0.26 (0.120)
Cycling for 15 minutes (24) -1.84 (0.137) -1.38 (0.126) -1.85 (0.142) -1.86 (-) -1.89 (0.140)
Change sheets and duvet cover on bed (25) -2.20 (0.149) -1.58 (0.131) -2.16 (0.151) -2.17 (-) -2.19 (0.150)
Caring for potted plants on a balcony (25) -1.65 (0.133) -1.20 (0.122) -1.62 (0.137) -1.62 (-) -1.63 (0.134)
Vacuuming a flight of stairs (26) -1.40 (0.128) -1.02 (0.120) -1.43 (0.133) -1.43 (-) -1.44 (0.130)
Washing a window from the outside (27) -1.30 (0.127) -0.84 (0.117) -1.24 (0.129) -1.25 (-) -1.27 (0.126)
Cycling with a heavy load of shopping (30) -0.74 (0.121) -0.41 (0.114) -0.77 (0.125) -0.77 (-) -0.76 (0.122)
Pumping up a bicycle tyre (33) -3.00 (0.188) -2.02 (0.145) -2.98 (0.199) -2.99 (-) -3.03 (0.193)
Travelling by plane (38) -2.14 (0.147) -1.38 (0.126) -2.10 (0.153) -2.10 (-) -2.11 (0.149)
Mopping a flight of stairs (39) -2.16 (0.147) -1.38 (0.126) -2.11 (0.154) -2.12 (-) -2.13 (0.147)
Vacuuming the inside of a car (48) -1.97 (0.141) -1.15 (0.122) -1.92 (0.151) -1.92 (-) -1.95 (0.142)
Swimming for an hour (+) (54) -1.25 (0.126) -0.56 (0.115) -1.19 (0.134) -1.20 (-) -1.18 (0.129)
Washing a car (82) -1.16 (0.125) -0.37 (0.114) -1.22 (0.143) -1.22 (-) -1.23 (0.131)
Mowing the lawn (102) -0.68 (0.121) 0.19 (0.115) -0.67 (0.140) -0.67 (-) -0.71 (0.122)
Repairing a puncture in bicycle tyre (133) -1.25 (0.126) 0.08 (0.114) -1.22 (0.156) -1.23 (-) -1.25 (0.127)
Cronbach's alpha coefficient for scale 0.87 0.84 0.81 0.81 0.87
  1. Item content and parameters. Item content with the number of patients responding in the 'not applicable' category (in parenthesis) and the estimates of the item parameters (β i ) and their standard errors (in parenthesis) for each of the procedures. Standard errors for the parameters in the 'tendency to respond' model are not currently available in the software. This is indicated by the symbol '-'. Items denoted by (++) demonstrated item misfit across more than one method and items denoted by (+) demonstrated item misfit for one method.