Table 4 Subgroup analysis for all-cause mortality at 30 days

Age

0.27

0.20

 <55

129/4834 (2.7)

0.85 (0.49–1.49)

0.67 (0.34–1.32)

1.76 (0.81–3.81)

1.79 (0.73–4.39)

 55–<75

597/8659 (6.9)

0.95 (0.74–1.22)

0.86 (0.63–1.16)

1.38 (1.03–1.87)

1.38 (0.96–1.99)

 ≥75

466/2614 (17.8)

0.77 (0.62–0.97)

0.97 (0.70–1.35)

0.90 (0.69–1.18)

1.27 (0.85–1.89)

Sex

0.07

0.88

 Male

708/12381 (5.7)

0.76 (0.61–0.94)

0.59 (0.45–0.77)

1.13 (0.87–1.47)

1.25 (0.89–1.75)

 Female

500/3847 (13.0)

0.86 (0.68–1.09)

0.93 (0.68–1.27)

1.18 (0.90–1.56)

1.46 (1.01–2.11)

Hospital class

0.65

0.96

 Province-level

251/5256 (4.8)

1.01 (0.66–1.55)

0.87 (0.53–1.43)

1.13 (0.70–1.82)

1.19 (0.67–2.10)

 Prefecture-level

670/8808 (7.6)

0.76 (0.61–0.94)

0.64 (0.48–0.84)

1.13 (0.88–1.45)

1.32 (0.95–1.85)

 County-level

287/2164 (13.3)

0.73 (0.54–0.99)

0.75 (0.50–1.12)

1.38 (0.93–2.03)

1.69 (1.01–2.83)

Time from onset

0.055

0.01

 <12 h

694/10818 (6.4)

0.69 (0.56–0.85)

0.52 (0.40–0.69)

0.99 (0.77–1.27)

0.97 (0.70–1.35)

 ≥12 h

503/5284 (9.5)

0.85 (0.66–1.09)

0.87 (0.63–1.20)

1.39 (1.03–1.87)

2.06 (1.41–3.01)

Primary PCI

0.89

0.39

 Yes

248/7017 (3.5)

0.77 (0.53–1.13)

0.75 (0.48–1.17)

0.85 (0.55–1.30)

0.95 (0.57–1.59)

 No

952/9069 (10.5)

0.78 (0.65–0.92)

0.69 (0.54–0.87)

1.24 (1.00–1.53)

1.41 (1.06–1.87)

Killip class

0.07

0.10

 I–II

866/14976 (5.8)

0.69 (0.58–0.83)

0.56 (0.44–0.72)

1.09 (0.88–1.34)

1.37 (1.02–1.83)

 III–IV

332/1181(28.1)

1.07 (0.77–1.50)

0.88 (0.59–1.32)

1.47 (0.95–2.28)

1.51 (0.91–2.52)

LVEF<40%

0.29

0.49

 No

362/11683 (3.1)

0.83 (0.61–1.14)

0.62 (0.41–0.92)

1.06 (0.76–1.49)

1.01 (0.64–1.60)

 Yes

126/929 (13.6)

1.08 (0.62–1.87)

1.11 (0.58–2.10)

1.32 (0.70–2.46)

1.23 (0.56–2.68)

GRACE score

0.88

0.89

 ≤140

124/6933 (1.8)

0.83 (0.46–1.49)

0.81 (0.41–1.58)

0.95 (0.50–1.79)

1.13 (0.54–2.38)

 >140

949/8500 (11.2)

0.94 (0.78–1.14)

0.97 (0.77–1.23)

1.15 (0.94–1.40)

1.30 (0.99–1.69)