Table 3. Individual item fit for RHS in order of difficulty.

Seq	Item	Location	Fit Residual	Chi Squared	Chi squared probability
1	Sit	-7.405	-0.035	0.658	0.7196
8	Supine to side lying	-6.647	0.085	20.584	0.0000*
4	Crook lying	-6.409	0.043	8.18	0.0167
2	Hands to head	-4.453	-0.022	1.89	0.3887
9	Rolls supine to prone	-3.909	-0.281	5.07	0.0793
11	Props on forearms	-3.385	-0.422	1.211	0.5459
3	Sit to lie	-3.247	-0.339	1.064	0.5875
13	Rolls prone to supine	-3.104	-0.757	5.047	0.0802
5	R hip flexion	-2.73	1.568	12.294	0.0021
6	L hip flexion	-2.386	2.496	8.413	0.0149
10	Lifts head from prone	-2.016	0.195	5.887	0.0527
12	Four point/ crawl	-1.155	-0.278	0.442	0.8018
16	Cruise / supported stand	-1.108	-0.933	1.517	0.4683
7	Lifts head supine	-0.717	1.103	9.377	0.0092
14	Lie to sit	-0.669	-0.686	0.645	0.7245
17	Standing	-0.226	-0.529	0.8	0.6704
18	Walking	0.127	0.075	3.808	0.1490
22	High kneeling	0.564	-0.319	2.067	0.3557
26	Stand on R leg	1.263	-0.507	1.135	0.5669
24	High kneel to L half	1.306	-0.405	2.511	0.2850
23	High kneel to R half	1.328	-0.559	2.397	0.3017
27	Stand on L leg	1.436	-0.452	0.975	0.6142
15	Sit to stand	1.533	-1.015	4.634	0.0986
30	Climb stairs	2.357	-0.662	1.13	0.5682
21	Stand to sit on floor	2.477	-0.432	0.118	0.9426
33	Down box step R	2.549	-0.244	0.428	0.8076
31	Descend stairs	2.555	-0.301	0.828	0.6609
35	Down box step L	2.716	-0.235	0.514	0.7734
32	Climbs box step R	2.831	-0.254	0.632	0.7289
34	Climbs box step L	2.857	-0.217	0.815	0.6655
19	Runs 10 metres	3.401	-0.398	0.672	0.7145
20	Squat up and down	3.735	-0.478	0.912	0.6338
25	Rise from floor	3.828	-0.264	0.326	0.8495
36	Jumps forward	3.896	-0.125	0.105	0.9605
28	Hops R	4.401	-0.156	0.32	0.8593
29	Hops L	4.407	-0.157	0.32	0.8591

* significant χ² probability p = 0.001