Table 1.

Characteristics of the examined population.

EXAMINED	Men	Women	Total number (%)
Number of patients	2102	6790	8892
N. of prostheses	2281	7454	9735
Mean age at surgery (C.I 95%)	71.4 (71.1–71.7)	72.1 (71.9–72.2)	71.9 (71.8–72.1)
BMI
Normal (BMI <= 25)	426	1414	1840 (18.9%)
Overweight (25 < BMI <= 30)	1252	3440	4692 (48.2%)
Obese (30 < BMI <= 40)	580	2451	3031 (31.1%)
Morbidly obese (BMI > 40)	23	149	172 (1.8%)
Type of insert
Fixed	1612	5312	6924 (71.1%)
Mobile	669	2142	2811 (28.9%)