Are daylight saving time transitions associated with changes in myocardial infarction incidence? Results from the German MONICA/KORA Myocardial Infarction Registry

Table 1 Demographic and clinical characteristics of the sample (n = 25,499)

Variable	n	%
Sex
Female	6,975	27
Male	18,524	73
Age [years] (mean ± std)		62.6 ± 9.2
≤65 years	13,522	53
>65 years	11,977	47
Survival
Out-of-hospital deaths	7,637	30
Died within 24 h	3,954	16
Died within 24 h to 28 days	1,157	4
Survivors (>28 days)	12,751	50
Recurrent myocardial infarction^a
yes	5,527	24
no	17,401	76
Current occupation^a
yes	5,496	27
no	15,067	73
Smoking^a
Current smoker	5,157	38
Former smoker	3,857	28
Never-smoker	4,569	34
Body Mass Index >30 kg/m²
yes	15,321	60
no	10,178	40
Hypertension^a
yes	14,998	66
no	7,846	34
Hyperlipidaemia^a
yes	12,667	57
no	9,692	43
Diabetes^a
yes	7,364	32
no	15,520	68
Antiplatelets^a
yes	5,798	28
no	14,877	72
Beta-blockers^a
yes	5,745	28
no	14,930	72
Calcium antagonists^a
yes	5,086	25
no	15,583	75
Angiotensin-converting enzyme (ACE) inhibitors^a
yes	3,992	22
no	14,223	78
Lipid-lowering agents^a
yes	3,052	17
no	15,152	83

^aPercentages refer to the number of non-missing values. Percent missing information per variable ranges from 10.1 % (recurrent infarction) to 46.7 % (smoking)

ISSN: 1471-2458