Guide to evaluating performance of prediction models for recurrent clinical events

Table 1 Characteristics of 155,163 people with asthma (OPCRD)

Variable		Column %	Number of exacerbations during observation period, row %
Variable		Column %	0 (49%)	1 (23%)	≥ 2 (28%)
Gender	Female	57	45	23	32
Gender	Male	43	56	21	23
Previous exacerbations	No	33	59	20	21
Previous exacerbations	Yes	67	45	23	32
Smoking status	Non-smoker	57	52	22	26
	Current smoker	15	46	22	32
	Ex-smoker	23	47	22	31
	Missing	5	47	22	31
Year of entry into study	2005	3	44	22	34
	2006	7	41	23	36
	2007	3	42	22	36
	2008	10	51	22	27
	2009	12	53	22	25
	2010	10	50	22	28
	2011	22	50	22	28
	2012	24	50	22	28
	2013	10	51	22	27
Age at entry into study, median (interquartile range)			44 (29, 58)	46 (33, 60)	50 (37, 63)

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