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Table 2 SFInX items and exclusion criteria where applicable
| Item | Reason of exclusion |
|---|---|
| Excluded during pilot testing | |
| 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 | |
| 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 | |
| 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 | |
