Table 1. Characteristics of population invited to breast cancer screening in province of Modena.

Characteristic	First round in 1996
No. of women invited	79,859
Total respondents	52,588
Spontaneous screening	1,458
Nonrespondents	20,498
Response rate (no. of invited respondents) (%)	65.8
Percentage no. of invited nonrespondents (%)	25.6
Total detection rate ( × 100,000)	10.2
Recall rate for biopsy ( × 100,000)	8.1
Rate of abandonment (%)	9.0