Table 1.
Age at enrolment of all women and age at diagnosis of breast cancer
| Arm | Age at enrolment (for all trial participants) | Age at diagnosis (for participants with breast cancer only) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total No | No of women aged <50 (%) | No of women aged ≥50 (%) |
P value | Mean age (SD (95% CI)) | Difference (95% CI) | Total No | No of women aged <50 (%) | No of women aged ≥50 (%) |
P value | Mean age (SD (95% CI)) | Difference (95% CI) | ||
| Screening | 75 177* | 54 212 (72.11) | 20965 (27.89) | 0.06 | 44.84 (7.90 (44.78 to 44.90)) | 0.078 (−0.002 to 0.158) | 640† | 161 (25.16) | 479 (74.84) | 0.01 | 55.18 (9.10 (54.47 to 55.88)) | 1.321 (0.330 to 2.312) |
|
| Control | 76 097* | 54 188 (71.21) | 21909 (28.79) | 44.92 (8.00 (44.86 to 44.97)) | 655 | 147 (22.44) | 508 (77.56) | 56.50 (9.10 (55.80 to 57.20)) | |||||
SD=standard deviation.
*
Information on age was not available for 183 women in the screening arm and 81women in the control arm among the total women enrolled.
†
Of the 641 women with breast cancer in the screening arm, one had bilateral breast cancer, who was considered only once.