Table 2 Odds ratios for the last magnesium concentration before delayed cerebral ischaemia, and occurrence of delayed cerebral ischaemia and poor outcome.

	No events/ No at risk	Crude OR (95% CI)	Adjusted* OR (95% CI)
DCI
1st quartile (⩾1.10 ⩽1.28 mmol/l)	13/41	Reference	Reference
2nd quartile (>1.28, ⩽1.40 mmol/l	4/38	0.3 (0.1–0.9)	0.2 (0.1–0.8)
3rd quartile (>1.40, ⩽1.62 mmol/l)	4/38	0.3 (0.1–0.9)	0.2 (0.0–0.8)
4th quartile (>1.62 mmol/l)	6/38	0.4 (0.1–1.2)	0.2 (0.1– 0.9)
Poor outcome
1st quartile (⩾1.10 ⩽1.28 mmol/l)	6/41	Reference	Reference
2nd quartile (>1.28, ⩽1.40 mmol/l)	8/38	1.6 (0.5–5.0)	1.8 (0.5–6.9)
3rd quartile (>1.40, ⩽1.62 mmol/l)	7/38	1.3 (0.4–4.3)	1.0 (0.2–4.5)
4th quartile (>1.62 mmol/l)	20/38	6.5 (2.2–18.9)	4.9 (1.2–19.7)

DCI, delayed cerebral ischaemia.

*Adjusted for age, clinical condition at admission and amount of blood on the initial CT scan.