Table 1

Description of hospital admissions (n=2 810 414 observations, study period 2002–17)

	Frequency	%	Mean	Variance	SD
All cause hospital admission			0.33	1.64	1.28
0	2 388 584	85
1	241 717	8.6
2	80 813	2.9
≥3	99 300	3.5
Cardiovascular hospital admission			0.04	0.14	0.37
0	2 753 992	98
1	29 432	1.1
2	13 091	0.5
≥3	13 899	0.5
Respiratory hospital admission			0.03	0.10	0.32
0	2 773 192	98.7
1	19 685	0.7
2	9538	0.3
≥3	7999	0.3
Infectious hospital admission			0.005	0.01	0.10
0	2 802 217	99.7
1	5174	0.2
2	1937	0.1
≥3	1086	0.04
Mental/behavioural disorders hospital admission			0.003	0.01	0.10
0	2 804 737	99.8
1	3521	0.1
2	1263	0.04
≥3	893	0.03
Hospital admission for other causes			0.26	1.18	1.09
0	2 448 665	87.1
1	225 980	8.0
2	66 976	2.4
≥3	68 793	2.5

Data source was the authors' own calculations based on data from the Scottish Longitudinal Study.