Table 1 Summary of reported data scenarios from McCormick Matthews [24]

1

i) P value/chi-square statistic for ln (HR) or HR

ii) Total number of events

6 (17%)

Equations 8 and 10, Parmar [8]

2

i) IPD

0 (0%)

Available statistical methods

3

i) KM survival plot

ii) Number at risk included at regular intervals

4 (11%)

Estimation from the KM plots, Guyot [16]

4a

i) KM survival plot

ii) No total number of events

iii) No number at risk included

iv) P-value/chi-square statistic for ln (HR) or HR (exact)

19 (53%)

Estimations from the KM plots, Parmar [8]

4b

v) P-value/chi-square statistic for ln (HR) or HR (non-exact)

4 (11%)

5

i) KM survival plot

ii) No total number of events

iii) No number at risk included

iv) No p value

3 (8%)

Estimations from the KM plots, Parmar [8]

Total

36 (100%)