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Table 2 The 79 items remaining in the calibrated item bank. The items remaining in the calibrated item bank. The number of respondents, to whom the item was offered (Offered to), the number responding in the category 'not applicable' (NA), the number responding in the category 'can' (can) and the number responding in the category 'cannot' (cannot) are given. The discrimination (β) and difficulty (β) parameters are given along with their standard errors in parentheses.

From: The AMC Linear Disability Score project in a population requiring residential care: psychometric properties

Description of item content Offered to Item response category Location parameter (β) Discrimination parameter (α)
   NA can cannot     
Walking up stairs with a bag 262 0 19 243 -3.607 (2.404) 1.122 (0.892)
Mopping a flight of stairs 262 5 16 241 -2.830 (1.708) 0.447 (0.411)
Cleaning the top of a high cupboard 281 2 27 252 -2.816 (1.946) 0.480 (0.393)
Cleaning a bathroom 293 1 37 255 -2.621 (2.061) 0.323 (0.338)
Vacuuming 274 0 33 241 -2.408 (1.844) 0.287 (0.280)
Going for a walk in the woods 281 0 31 250 -2.343 (1.636) 0.362 (0.340)
Fetching groceries for 3–4 days 293 0 36 257 -2.262 (1.623) 0.353 (0.343)
Mopping the floor 281 2 41 238 -2.225 (1.902) 0.339 (0.374)
Caring for plants on a balcony 262 1 32 229 -2.108 (1.616) 0.314 (0.325)
Travelling by bus or tram 281 0 44 237 -2.093 (1.835) 0.308 (0.370)
Walking up two flights of stairs 274 0 39 235 -1.921 (1.532) 0.277 (0.298)
Cleaning a fridge 293 2 64 227 -1.406 (1.464) 0.171 (0.236)
Going to a restaurant 293 3 60 230 -1.335 (1.238) 0.159 (0.188)
Carrying a tray 281 1 75 205 -1.304 (1.774) 0.222 (0.326)
Going for a long walk (15+ minutes) 281 0 72 209 -1.290 (1.629) 0.178 (0.277)
Going to the dentist 293 18 75 200 -1.283 (1.881) 0.205 (0.299)
Sweeping the floor 262 1 70 191 -1.239 (1.902) 0.196 (0.313)
Cutting toe nails 262 0 45 217 -1.175 (0.786) 0.136 (0.144)
Walking up a hill or bridge 281 3 73 205 -1.133 (1.425) 0.137 (0.198)
Walking up one flight of stairs 274 2 67 205 -1.127 (1.382) 0.155 (0.222)
Going to a concert 262 0 57 205 -0.996 (0.860) 0.113 (0.128)
Going to the pharmacist 262 2 75 185 -0.976 (1.572) 0.131 (0.201)
Hanging a load of washing out 293 10 84 199 -0.960 (1.514) 0.144 (0.240)
Going to the post office or bank 274 0 88 186 -0.948 (1.881) 0.151 (0.248)
Going to a party 281 1 69 211 -0.924 (0.878) 0.109 (0.129)
Filling an official form in 281 1 68 212 -0.896 (0.790) 0.106 (0.119)
Using a washing machine 281 6 95 180 -0.851 (1.743) 0.153 (0.244)
Visiting an outpatients' clinic 293 0 95 198 -0.815 (1.317) 0.112 (0.161)
Taking bottles to the bottle bank 281 5 108 168 -0.675 (1.840) 0.153 (0.312)
Short walk (less than 15 minutes) 274 0 95 179 -0.645 (1.358) 0.108 (0.166)
Putting a rubbish bag outside 293 5 108 180 -0.573 (1.338) 0.116 (0.198)
Reaching into a high cupboard 274 0 95 179 -0.569 (1.097) 0.099 (0.172)
Using a dustpan and brush 262 2 103 157 -0.537 (1.865) 0.135 (0.335)
Opening and closing a high window 281 0 140 141 -0.078 (1.290) 0.096 (0.166)
Fetching groceries for one day 262 0 128 134 -0.043 (1.373) 0.099 (0.184)
Using a public toilet 293 5 159 129 0.139 (1.835) 0.110 (0.241)
Putting flowers in a vase 293 2 162 129 0.169 (1.787) 0.107 (0.240)
Frying an egg 281 3 154 124 0.178 (1.982) 0.115 (0.261)
Warming up a tin of soup 293 1 164 128 0.203 (1.919) 0.113 (0.232)
Cleaning a toilet 262 0 149 113 0.308 (1.528) 0.105 (0.203)
Putting socks and lace up shoes on 281 1 167 113 0.314 (1.165) 0.093 (0.157)
Changing the bulb in a table light 281 1 177 103 0.533 (1.541) 0.116 (0.174)
Cleaning a bathroom sink 281 5 170 106 0.564 (2.089) 0.126 (0.302)
Cutting finger nails 262 0 168 94 0.605 (1.337) 0.114 (0.173)
Rubbing lotion into whole body 262 4 164 94 0.627 (1.469) 0.115 (0.184)
Reaching into a low cupboard 274 0 184 90 0.672 (1.131) 0.106 (0.152)
Picking something up off the floor 262 0 172 90 0.712 (1.466) 0.129 (0.198)
Making porridge 293 2 191 100 0.714 (1.704) 0.119 (0.216)
Getting in and out of a car 281 3 185 93 0.738 (1.656) 0.132 (0.209)
Shaking a tablecloth out 274 2 190 82 0.906 (1.438) 0.125 (0.204)
Making a bed 281 0 193 88 1.003 (2.028) 0.152 (0.292)
Preparing breakfast or lunch 262 1 186 75 1.117 (1.729) 0.169 (0.279)
Using the lift in a public building 262 2 199 61 1.208 (1.299) 0.158 (0.186)
Putting an alarm clock right 281 4 216 61 1.319 (1.431) 0.165 (0.199)
Pulling a blanket up 293 0 253 40 1.485 (0.898) 0.167 (0.149)
Visiting the neighbours 293 1 231 61 1.548 (1.685) 0.221 (0.252)
Travelling as a passenger in a car 274 3 230 41 1.592 (1.126) 0.222 (0.192)
Shaving face or applying make up 274 1 233 40 1.593 (1.075) 0.180 (0.164)
Watering a house plant 262 3 204 55 1.600 (1.681) 0.226 (0.259)
Opening and closing a window 262 0 201 61 1.735 (2.137) 0.246 (0.343)
Putting trousers on 293 2 224 67 1.821 (2.372) 0.295 (0.406)
Making coffee or tea 293 0 235 58 1.832 (1.936) 0.237 (0.290)
Peeling an apple 281 1 233 47 1.859 (1.631) 0.226 (0.219)
Making a bowl of cereal 281 1 225 55 1.860 (1.921) 0.222 (0.256)
Eating a meal at the table 293 0 255 38 2.081 (1.509) 0.253 (0.225)
Hanging clothes up in a cupboard 262 0 203 59 2.105 (2.595) 0.344 (0.481)
Opening and closing curtains 262 0 216 46 2.129 (1.958) 0.366 (0.357)
Moving between two dining chairs 281 0 237 44 2.214 (1.905) 0.389 (0.375)
Putting a scarf and gloves on 293 1 259 33 2.364 (1.617) 0.306 (0.246)
Making a cheese sandwich 281 1 243 37 2.416 (1.856) 0.392 (0.333)
Moving to sit on the edge of a bed 262 1 231 30 2.457 (1.658) 0.309 (0.244)
Putting a coat on 274 0 227 47 2.463 (2.323) 0.425 (0.395)
Putting a shirt or blouse on 262 0 228 34 2.495 (1.842) 0.360 (0.287)
Washing upper body at a sink 274 0 243 31 2.705 (1.875) 0.420 (0.327)
Answering the front door 274 1 233 40 2.792 (2.373) 0.481 (0.449)
Getting out of bed into a chair 262 0 232 30 3.019 (2.132) 0.581 (0.448)
Washing lower body at sink 293 1 241 51 3.037 (3.098) 0.722 (0.761)
Putting a T-shirt on 293 2 257 34 3.440 (2.664) 0.718 (0.630)
Locking a door 262 0 230 32 3.366 (2.512) 0.970 (0.749)
  1. NA denotes that the category 'not applicable' was chosen