Table 1.

Patient demographics: overall refers to the entire data series, combining both cobalt chrome and zirconia

Head type	N (hips)	Sex	Age (years)	Height (cm)	Weight (kg)	BMI	Average length of F/U (years)
Cobalt chrome	35	9 Male	62.1	166.5	84.2	30.3	4.6
		26 Female
Zirconia	68	29 Male	53.2	169.0	82.9	28.9	3.6
		39 Female
p value		0.04	0.001	0.3	0.8	0.4	0.005
Overall	103	38 Male	56.3	168.1	83.3	29.4	4.0
		65 Female