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Table 2 SFInX items and exclusion criteria where applicable

From: The Shoulder Function Index (SFInX): a clinician-observed outcome measure for people with a proximal humeral fracture

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
  1. *Added items during pilot testing.