Table 4.

Comparison of the results of random-effects vs. fixed-effects models.

Analysis groups	HR (95% CI), random-effects model	HR (95% CI), fixed-effects model
Total	0.65 (0.60, 0.71)	0.74 (0.73, 0.76)
Influenza vaccination	0.74 (0.63, 0.87)	0.89 (0.87, 0.91)
Herpes zoster vaccination	0.69 (0.66, 0.73)	0.69 (0.67, 0.72)
Tdap vaccination	0.69 (0.58, 0.82)	0.80 (0.77, 0.84)
BCG vaccination	0.42 (0.17, 1.07)	0.62 (0.50, 0.76)
Pneumonia vaccination	0.68 (0.41, 1.13)	1.00 (0.96, 1.03)
Poliomyelitis vaccination	0.78 (0.44, 1.40)	0.95 (0.80, 1.11)
Other vaccination	0.77 (0.73, 0.81)	0.78 (0.74, 0.81)
Male	0.66 (0.58, 0.74)	0.65 (0.60, 0.69)
Female	0.67 (0.63, 0.72)	0.67 (0.63, 0.72)
<70 years	0.74 (0.66, 0.84)	0.74 (0.70, 0.78)
≥70 years	0.64 (0.57, 0.72)	0.72 (0.71, 0.74)
1 dose vaccine	1.03 (0.98, 1.08)	1.03 (0.98, 1.08)
2-3 dose vaccine	0.87 (0.74, 1.02)	0.94 (0.91, 0.98)
≥4 dose vaccine	0.51 (0.32, 0.80)	0.65 (0.62, 0.68)
Alzheimer’s disease	0.63 (0.55, 0.72)	0.78 (0.75, 0.81)