Table 2.

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

Interval, i	Time in months, triski	Lower, loweri	Upper, upperi	Number at risk, nriski
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