Table 3.

Univariable and multivariable associations between age categories and outcomes in patients who had OHCA

	Number of cases (%)	Unadjusted ORs (95% CI)	P values	Adjusted ORs (95% CI)*	P values
Primary analysis
Age as continuous variable
Neurologically favourable outcomes	10 (7)	0.97 (0.93 to 1.02)	0.24	0.96 (0.91 to 1.01)	0.08
One-month survival	28 (19)	0.98 (0.96 to 1.01)	0.31	0.96 (0.93 to 0.99)	0.04
Age as categorical variable
Neurologically favourable outcomes
Age 18–49 years (n=23)	3 (13)	1 (reference)		1 (reference)
Age 50–59 years (n=35)	1 (3)	0.20 (0.02 to 2.01)	0.17	0.15 (0.01 to 1.87)	0.18
Age 60–69 years (n=44)	5 (11)	0.85 (0.19 to 3.95)	0.84	0.56 (0.10 to 3.25)	0.94
Age ≥70 years (n=42)	1 (2)	0.16 (0.02 to 1.66)	0.13	0.08 (0.01 to 1.00)	0.051
One-month survival
Age 18–49 years (n=23)	5 (22)	1 (reference)		1 (reference)
Age 50–59 years (n=35)	7 (20)	0.90 (0.25 to 3.27)	0.87	0.74 (0.17 to 3.34)	0.70
Age 60–69 years (n=44)	12 (27)	1.35 (0.41 to 4.45)	0.62	0.83 (0.20 to 3.40)	0.80
Age ≥70 years (n=42)	4 (10)	0.38 (0.09 to 1.58)	0.18	0.14 (0.03 to 0.80)	0.03

*Adjusted for witnessed arrest, bystander CPR, shockable rhythm, re-arrest after ROSC during transportation, and pH on hospital arrival.

OHCA, out-of-hospital cardiac arrest.