Enhanced secondary analysis of survival data: reconstructing the data from published Kaplan-Meier survival curves

Table 2 Example of number at risk file (corresponding to Figure 1, radiotherapy arm)

Interval, i	Time in months, trisk_i	Lower, lower_i	Upper, upper_i	Number at risk, nrisk_i
1	0	1	30	213
2	10	31	58	122
3	20	59	83	80
4	30	84	102	51
5	40	103	120	30
6	50	121	128	10

ISSN: 1471-2288