Table 7.

Analysis results of actual example (intervention indicator only)

Dealing with clusters	Statistical model	Parameter Estimates	Standard Error
				HR [95%CI]	p-value
With stratification by clusters	AG	0.033	0.122	1.034 [0.814, 1.314]	0.785
	PWP-TT	-0.061	0.123	0.941 [0.739, 1.198]	0.621
	PWP-GT	0.054	0.117	1.056 [0.840, 1.327]	0.641
Without stratification by clusters	AG	0.096	0.094	1.102 [0.915, 1.326]	0.306
	PWP-TT	0.040	0.095	1.041 [0.863, 1.254]	0.676
	PWP-GT	0.087	0.091	1.090 [0.912, 1.304]	0.360

AG Andersen-Gill, PWP-TT Prentice-Williams-Peterson Total-Time, PWP-GT Prentice-Williams-Peterson Gap-Time, HR Hazard ratio, CI Confidence interval