Association between magnesium in drinking water and atrial fibrillation incidence: a nationwide population-based cohort study, 2002–2015

Table 2 Main results of the association between magnesium in drinking water as five residential exposure groups and incidence of atrial fibrillation

Magnesium exposure group	PY	Incident AF	IR per 100.000 PY	IRR (95% CI)
Magnesium exposure group	PY	Incident AF	IR per 100.000 PY	Crude^a	Semi-adjusted^b	Fully adjusted^c
1: 0.1–5 mg/L	4,915,009	24,671	502	1.00 (ref)	1.00 (ref)	1.00 (ref)
2: > 5–10 mg/L	12,307,633	60,468	491	0.98 (0.96; 1.19)	0.98 (0.96; 0.99)	0.98 (0.97; 1.00)
3: > 10–15 mg/L	10,063,416	49,749	494	0.98 (0.97; 1.00)	1.00 (0.99; 1.02)	1.01 (0.99; 1.02)
4: > 15–20 mg/L	5,856,071	30,940	528	1.05 (1.04; 1.07)	1.05 (1.03; 1.06)	1.07 (1.05; 1.08)
5: > 20–60 mg/L	11,589,566	57,170	493	0.98 (0.97; 1.00)	1.05 (1.04; 1.07)	1.07 (1.05; 1.08)

Note: PY Person years, AF Atrial fibrillation, IR Incidence rate, IRR incidence rate ratio, CI Confidence interval
^aNo adjustment
^bAdjusted for age, sex, and calendar year
^cAdjusted for age, sex, calendar year, cohabitation, education and income

ISSN: 1476-069X