Table 2.
Final calibration of the six diagnostic groups after the splitting of the DIF items into two main groups: asymmetric disorders (CS, CP) and symmetric disorders (RA, SSc, NMDc, NMDa)
| Hands involvement | Responded by |
Difficulty* (logits) | SE (logits) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Item | CS | CP | RA | SSc | NMDc | NMDa | |||
| a01 Hammering a nail | 2C | x | 3.60 | 0.23 | |||||
| a02 Cutting one's nails | 2C | x | x | 3.32 | 0.15 | ||||
| a03 Threading a needle | 2C | x | 3.31 | 0.23 | |||||
| a04 Peeling potatoes with a knife | 2C | x | 3.28 | 0.23 | |||||
| a05 Wrapping up gifts | 2C | x | 3.20 | 0.25 | |||||
| a06 Filing one's nails | 2C | x | 2.82 | 0.21 | |||||
| a07 Peeling onions | 2C | x | 2.67 | 0.24 | |||||
| s08 Shelling hazel nuts | 2C | x | x | 2.38 | 0.14 | ||||
| a08 Shelling hazel nuts | 2C | x | 2.23 | 0.24 | |||||
| a09 Winding up a wristwatch | 2B | x | 2.08 | 0.20 | |||||
| a10 Using a screwdriver | 2B | x | 2.04 | 0.22 | |||||
| s01 Hammering a nail | 2C | x | x | 1.88 | 0.15 | ||||
| s11 Taking the cap off a bottle | 2B | x | x | x | 1.84 | 0.12 | |||
| a12 Screwing on a nut | 2B | x | 1.81 | 0.25 | |||||
| s04 Peeling potatoes with a knife | 2C | x | x | x | 1.56 | 0.12 | |||
| a13 Sharpening a pencil | 2C | x | x | 1.31 | 0.16 | ||||
| a11 Taking the cap off a bottle | 2B | x | 1.09 | 0.23 | |||||
| s07 Peeling onions | 2C | x | x | 0.91 | 0.14 | ||||
| a14 Spreading butter on a slice of bread | 2B | x | x | 0.74 | 0.16 | ||||
| b15 Fastening a snap (eg, jacket, bag) | 2A | x | x | x | x | x | x | 0.68 | 0.09 |
| a16 Replacing a light bulb | 2B | x | 0.59 | 0.30 | |||||
| s06 Filing one's nails | 2C | x | x | 0.59 | 0.14 | ||||
| s16 Replacing a light bulb | 2B | x | x | 0.48 | 0.15 | ||||
| s05 Wrapping up gifts | 2C | x | x | 0.46 | 0.15 | ||||
| a17 Opening mail | 2B | x | x | 0.41 | 0.16 | ||||
| a18 Handling a stapler | 2A | x | 0.19 | 0.30 | |||||
| b19 Peeling a banana | 2B | x | x | −0.19 | 0.15 | ||||
| b20 Filling a glass with water | 2A | x | x | x | −0.20 | 0.12 | |||
| b21 Opening a pack of biscuits | 2B | x | x | x | −0.20 | 0.13 | |||
| s22 Turning on a tap | 1 | x | x | −0.21 | 0.15 | ||||
| b23 Opening a car door | 1 | x | x | −0.48 | 0.15 | ||||
| a24 Opening a bread box | 2A | x | −0.56 | 0.22 | |||||
| s25 Picking up a can | 1 | x | x | x | x | −0.93 | 0.12 | ||
| b26 Throwing a ball | 1 | x | x | −0.99 | 0.16 | ||||
| b27 Brushing one's hair | 1 | x | x | x | x | −1.20 | 0.13 | ||
| a28 Unwrapping candy | 2C | x | −1.20 | 0.23 | |||||
| a22 Turning on a tap | 1 | x | −1.41 | 0.26 | |||||
| b29 Washing one's face | 1 | x | x | x | x | −1.63 | 0.14 | ||
| a30 Placing a glass of water on a table | 1 | x | x | −1.70 | 0.22 | ||||
| s31 Dealing cards | 2B | x | −1.80 | 0.25 | |||||
| a32 Drinking a glass of water | 1 | x | x | −1.87 | 0.25 | ||||
| a33 Handling a four-colour ballpoint pen with one hand | 1 | x | −2.02 | 0.37 | |||||
| a34 Counting banknotes | 2A | x | −2.20 | 0.29 | |||||
| b35 Turning on a radio | 1 | x | x | x | x | −2.28 | 0.18 | ||
| a36 Wiping one's hands | 2A | x | −2.32 | 0.26 | |||||
| s37 Using a fork | 1 | x | x | x | −2.51 | 0.21 | |||
| s38 Turning on a television | 1 | x | x | x | x | −2.56 | 0.18 | ||
| b39 Piling up Lego blocks | 2A | x | x | −2.74 | 0.21 | ||||
| b40 Using a spoon | 1 | x | x | x | −3.35 | 0.17 | |||
| a38 Turning on a television | 1 | x | x | −3.43 | 0.38 | ||||
| a41 Turning off a tap | 1 | x | −3.54 | 0.56 | |||||
| s42 Blowing one's nose | 1 | x | x | −3.93 | 0.23 | ||||
*Higher logit values indicate a greater manual ability for more difficult activities.
a, asymmetric disorders (CS, CP); s, symmetric disorders (RA, SSc, NMDc, NMDa); b, both symmetric and asymmetric disorders; 1 indicates unimanual activities; 2 indicates bimanual activities manageable in several unimanual steps (2A); requiring stabilisation with one hand and digital activity with the other (2B); requiring digital activity from both hands (2C). CP, cerebral palsy; CS, chronic stroke; NMDa, neuromuscular adults; NMDc, neuromuscular children; RA, rheumatoid arthritis; SE, standard error; SSc, systemic sclerosis.