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Table 2 Example data extraction form with data extracted from bladder cancer Kaplan-Meier plot in Figure 1.

From: Practical methods for incorporating summary time-to-event data into meta-analysis

Time at start of interval (months) % Event-free on research % Event-free on control Reported numbers at risk on research Reported numbers at risk on control
0 100 100 491 485
3 97 97 - -
6 92 92 - -
9 86 84 - -
12 78 75 372 355
15 73 70 - -
18 68 63 - -
21 65 60 - -
24 62 58 283 257
27 60 56 - -
30 58 54 - -
33 56 52 - -
36 54 51 200 187
42 52 49 - -
48 51 46 139 132
54 49 44 - -
60 49 43 93 80