Thanks @adreamer, I had been thinking about this as well and...

Thanks @adreamer, I had been thinking about this as well and you've prompted me to do a little more investigation. I recreated the graph (as best as i could) in CAD to get the scaling correct and then progressed each participant 35 days (5 weeks, approx todays date) and 42 days (6 weeks), please keep in mind that the accuracy of this is rough at best:

	Overall Survival Probability
1	Participant	Measured (by hand)	Measured (by CAD)	+5 Weeks (35 days)	+6 Weeks (42 days)
2	1	0.37	0.368	0.305	0.291
3	2	0.375	0.377	0.310	0.306
4	3	0.38	0.382	0.325	0.310
5	4	0.385	0.384	0.329	0.322
6	5	0.39	0.392	0.370	0.356
7	6	0.46	0.46	0.386	0.382
8	7	0.715	0.724	0.607	0.587
9	8	0.725	0.73	0.619	0.595
10	9	0.74	0.744	0.670	0.646
11	10	0.775	0.779	0.726	0.708
12	11	0.79	0.794	0.735	0.728
13	12	0.805	0.807	0.743	0.735
14
15	Probability	0.069%	0.072%	0.014%	0.010%
16	1 in	1452	1388	6937	9665

What I found interesting about the results is that as each day passes, the survival probability decreases at a faster rate


cheers, Mark