Table 4.

Studies reporting age as possible predictor of functional outcome after THA

			Measurement	FU period	Significance
Author, year	Grade	N of pts	tool	(months)	Level (p value)	Association	Predictor level of measurement
Kessler, 2007	Moderate	76	WOMAC	ST (3 m)	0.03	Neg	Cont (age)
Nankaku, 2013	Moderate	204	Ambulatory status ST (6 m)		Yes	Neg	Dich
							(1: age >67.5 2: age ?67.5 )
Slaven, 2012	Low	40	LEFS	ST (6 m)	No	No	Dich
							(1: age >68.5 2: age ?68.5)
Hamilton, 2012	Low	1410	OHS	ST (6 m)	X	No	Cont (age)
			SF-12	ST (12 m)	X	No
Quintana, 2009	Moderate	788	WOMAC PF	ST (6 m)	0.41	No	Dich
				ST (24 m)	0.001	Neg	(1: age >70 2: age ?70)
Stevens, 2012	Moderate	653	WOMAC	ST (12 m)	0.01	Neg	Cont (age)
Wang, 2010	Moderate	97	WOMAC	ST (12 m)	No	No	Cont (age)
Dowsey, 2014	High	835	HHS	ST (12 m)	<0.0001	Neg	Cont (age)
			SF-12 PCS		0.003	Neg
Nilsdotter, 2002	Moderate	148	WOMAC PF	ST (12 m)	0.004	Neg	Dich
			SF-36		0.002	Neg	(1: age >72 2: age ?72)
Bergschmidt, 2010	Moderate	100	HHS	ST (12 m)	>0.097	No	Cat (3)
			WOMAC		>0.097	No	(1: age <60 2: age 60–69 3: age >69
			SF-12		>0.097	No
Bischoff, 2004	Moderate	922	WOMAC PF	LT (36 m)	X	No	Dich
							(1: age >75 2: age ?75)
Judge, 2013	High	1431	OHS	LT (36 m)	NA	Neg	Cat (3)
							(1: age <50 2: age 50–60 3: age >60
Smith, 2012	Moderate	1683	HHS	LT (36 m)	<0.001	Neg	Cont (age)
Nilsdotter, 2003	Low	211	WOMAC PF	LT (43 m)	0.002	Neg	Cont (age)
Gandhi, 2010	Low	636	WOMAC	LT (39 m)	<0.05	Neg	Cont (age)
			SF-36		<0.05

All significant results are bold.

BMI, body mass index; Cat, categorical; Cont, continuous; Dich, dichotomous; FU, follow-up; HHS, Harris Hip Score; LEFS, Lower Extremity Functional Scale; LT, long-term; N of pts, number of patients; NA, not applicable; Neg, negative; OHS, Oxford Hip Score; Pos, positive; SF-36 PF, Short Form 36 physical function; ST, short-term; THA, total hip arthroplasty; WOMAC, Western Ontario and Mcmaster Universities Osteoarthritis Index.