Table 3. Summary statistics for main outcome variables by group

	Named GP		No named GP
	Obs	Mean	SD	Obs	Mean	SD
Continuity
UPC	17 044	0.484	0.236	28 591	0.457	0.217
UPC first	6412	0.675	0.255	11 108	0.638	0.248
Care utilisation
Number of GP visits	23 762	5.95	5.29	42 301	5.32	5.04
Number of GP visits for first chronic condition	23 762	1.83	2.52	42 301	1.73	2.49
Number of nurse visits	23 762	5.18	8.41	42 301	5.01	8.89
Any OOH visit	23 762	0.175	0.38	42 301	0.19	0.392
Any ED visits	23 762	0.354	0.478	42 301	0.348	0.476
Any unplanned hospitalisation	23 762	0.233	0.423	42 301	0.226	0.418
Attrition
Still registered t+1	23 762	0.974	0.16	42 301	0.968	0.177
Still registered t+2	23 762	0.956	0.204	42 301	0.944	0.23
Still registered t+3	23 762	0.94	0.237	42 301	0.924	0.265
Still registered t+4	23 762	0.925	0.263	42 301	0.907	0.291
Death (1 year)	23 762	0.0152	0.122	42 301	0.0134	0.115
Death (2 years)	23 762	0.0241	0.153	42 301	0.0208	0.143
Death (3 years)	23 762	0.0335	0.18	42 301	0.0289	0.167
Death (4 years)	20 703	0.0454	0.208	35 511	0.0396	0.195

The table shows the mean (or proportion for binary variables) and standard deviation (SD) of the outcome variables for the sample used in each model (Obs). The sample generally includes the whole study population, with the following exceptions: 1) For the two continuity variables (usual provider of care [UPC] index), the sample includes individuals with at least three GP visits during follow-up; for visits with any diagnosis (UPC) and for visits related to the new chronic condition (UPC first). 2) For the variable indicating mortality in t+4, the sample excludes patients diagnosed in 2015, because of a lack of data regarding deaths in the final follow-up year for that cohort.
ED = emergency department. OOH = out of hours.