Is the debate over?

Is the debate over?

Table 1: Frequency of selected events in the Canadian National Breast Screening Study, by study arm

Study arm; no. of subjects

Event Age Mammography Usual care p value

Prior health claim for breast cancer¹⁰ 40-59 8 1 0.05†

Alteration of name in allocation book* 40-49 95 65 0.01

Advanced breast cancer detected at baseline by physical examination^7-9 40-49 17 5 0.003

Death from breast cancer in 7-year followup period⁸ 40-49 38 28 0.27†

*Data from the review by Bailar and MacMahon (see pages 193 to 199).
†Calculated by the chi² test.

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Table 1: Frequency of selected events in the Canadian National Breast Screening Study, by study arm
		Study arm; no. of subjects
Event	Age	Mammography	Usual care	p value
Prior health claim for breast cancer¹⁰	40-59	8	1	0.05†
Alteration of name in allocation book*	40-49	95	65	0.01
Advanced breast cancer detected at baseline by physical examination^7-9	40-49	17	5	0.003
Death from breast cancer in 7-year followup period⁸	40-49	38	28	0.27†
*Data from the review by Bailar and MacMahon (see pages 193 to 199). †Calculated by the chi² test.