Table 1.

Construct validity between the Short-Form 12 (SF-12) and the foot and ankle outcome score (FAOS)

SF-12 subdomain	Stat	FAOS pain	FAOS symptoms	FAOS ADLs	FAOS sports/rec	FAOS QoL
Physical function	Correlation coefficient	0.5101	0.4185	0.7191	0.3506	0.634
	p Value	<0.0001	<0.0001	<0.0001	<0.0001	<0.0001
	N	123	123	123	123	123
Role-physical	Correlation coefficient	0.4512	0.2964	0.4805	0.3198	0.5638
	p Value	<0.0001	0.0008	<0.0001	0.0003	<0.0001
	N	124	124	124	124	124
Bodily pain	Correlation coefficient	0.5427	0.3276	0.5138	0.3406	0.5489
	p Value	<0.0001	0.0002	<0.0001	0.0001	<0.0001
	N	121	121	121	121	121
General health	Correlation coefficient	0.1682	0.0904	0.2373	−0.037	0.1382
	p Value	0.0618	0.318	0.008	0.6771	0.1257
	N	124	124	124	124	124
Vitality	Correlation coefficient	0.3734	0.1485	0.3337	0.1029	0.3037
	p Value	<0.0001	0.0984	0.0001	0.2531	0.0006
	N	125	125	125	125	125
Social functioning	Correlation coefficient	0.4148	0.3563	0.3842	0.2465	0.4124
	p Value	<0.0001	<0.0001	<0.0001	0.0062	<0.0001
	N	122	122	122	122	122
Role-emotional	Correlation coefficient	0.3386	0.2948	0.2767	0.1653	0.3276
	p Value	0.0001	0.001	0.0021	0.0699	0.0002
	N	121	121	121	121	121
Mental health	Correlation coefficient	0.2695	0.0921	0.2042	0.0766	0.2239
	p Value	0.0024	0.3067	0.0223	0.3958	0.0121
	N	125	125	125	125	125
Physical health component	Correlation coefficient	0.5773	0.4298	0.6577	0.4028	0.6444
	p Value	<0.0001	<0.0001	<0.0001	<0.0001	<0.0001
	N	115	115	115	115	115
Mental health component	Correlation coefficient	0.2769	0.1472	0.1555	0.0379	0.1684
	p Value	0.0027	0.1164	0.097	0.6869	0.0719
	N	115	115	115	115	115

Construct validity assesses whether the obtained FAOS scores accurately reflect the outcomes they are intended to measure though comparison with the SF-12. ADLs activities of daily living, QoL quality of life