Table 3.

Conditional item response probabilities for the quality indicators for each cluster

	Quality indicators	Overall	Cluster
		n (%)	High (n=659, 38%)	Moderate (n=184, 11%)	Low (n=286, 17%)	None (n=595, 35%)
Pain assessment	Assessed	1092 (63)	0.978	0.961	0.922	0.014
	Not assessed	632 (37)	0.022	0.039	0.078	0.987
Function assessment	Assessed	1070 (62)	0.981	0.955	0.873	0.000
	Not assessed	654 (38)	0.019	0.045	0.127	1.000
OA information	Given	764 (44)	0.930	0.463	0.319	0.001
	Considered, not given	85 (5)	0.009	0.330	0.011	0.000
	Not considered	875 (51)	0.062	0.207	0.670	1.000
Exercise advice	Given	768 (45)	0.994	0.417	0.237	0.000
	Considered, not given	96 (6)	0.007	0.313	0.067	0.000
	Not considered	860 (50)	0.000	0.270	0.696	1.000
Weight advice	Given	536 (31)	0.593	0.115	0.089	0.000
	Considered, not given	153 (9)	0.298	0.733	0.347	0.441
	Not considered	1035 (60)	0.109	0.152	0.564	0.559
Topical NSAID/paracetamol	Prescribed	609 (35)	0.476	0.273	0.394	0.239
	Considered, not prescribed	570 (33)	0.496	0.641	0.406	0.004
	Not considered	545 (32)	0.028	0.086	0.200	0.757
	Referred	124 (7)	0.111	0.037	0.101	0.032
Physiotherapy	Considered, not referred	532 (31)	0.559	0.732	0.080	0.000
	Not considered	1068 (62)	0.330	0.230	0.819	0.968
Median count (IQR): assessed/prescribed/given/referred			5 (4. 6)	3 (2. 3)	3 (2. 3)	0 (0. 1)
Median count (IQR): considered			1 (1. 2)	3 (2. 4)	1 (0. 1)	0 (0. 1)

NSAID, non-steroidal anti-inflammatory drug; OA, osteoarthritis.