Table 2 SFInX items and exclusion criteria where applicable
Item | Reason of exclusion |
|---|---|
Excluded during pilot testing | Â |
 Get into bed | Not possible to judge the ability to perform this task |
 Lying flat, arms by the side | Not possible to judge the ability to perform this task |
 Get out of bed | Not possible to judge the ability to perform this task |
 Push up from chair | Not possible to judge the ability to perform this task |
 Push/slide chair forward | Consistency issues between testing locations |
 Reach with supporting hand | Did not measure ‘shoulder function’ |
Excluded after pilot testing | Â |
 Put on socks | Dressing requirements |
 Put on shoes | Dressing requirements |
 Put on jacket | Dressing requirements |
 Close zip on jacket | Dressing requirements |
 Keyboard | Lack of discrimination between people |
 Push off wall with 2 hands | Lack of discrimination between people |
 Lift object with arm by side | Redundant with item ‘hold object with arm by side’ included |
 Place item at shoulder level | Redundant with item ‘place object at shoulder level’ included |
 *Wash wall/window | Lacked appropriate simulation of target task |
Excluded prior to Rasch analysis | Â |
 Arm swing in walking | Did not measure ‘shoulder function’ |
 Lying on unaffected side | Lack of discrimination between people |
 Turn around in bed | Lack of discrimination between people |
Excluded based on findings from Rasch analysis | |
 Light switch | Overfitting Rasch model, redundant |
 Hitch up trousers | Overfitting Rasch model, redundant |
 Place object above head with 2 hands | Overfitting Rasch model, contributing to potential second dimension |
Included items into final 13-item SFInX | |
 1 drink from cup | |
 2 wash opposite armpit | |
 3 wash back of opposite shoulder | |
 4 comb hair | |
 5 tuck shirt into trousers | |
 6 wash lower back | |
 7 lying on affected side | |
 8 reach behind to get object | |
 9 hold object with arm by side | |
 10 carry heavy object with 2 hands | |
 11 place object at shoulder level | |
 12 hang up washing (sustained activity above head) | |
 13* throw ball overhead with 2 hands | |