Table 2 Cumulative numbers of infections with SARS-CoV-2 in the counterfactual scenarios.

From: Evaluating the COVID-19 vaccination program in Japan, 2021 using the counterfactual reproduction number

Age group (years)

Scenarioa

Estimate (thousand)

95% confidence interval

Relative change (%)b

0–9

Early

93

87–99

 − 72

Late

498

477–518

50

Elevated

109

103–115

 − 67

10–19

Early

324

304–345

 − 30

Late

1677

1611–1740

260

Elevated

375

354–398

 − 20

20–29

Early

537

508–567

 − 56

Late

2470

2373–2563

101

Elevated

597

565–629

 − 51

30–39

Early

314

295–332

 − 60

Late

1545

1478–1610

95

Elevated

356

336–376

 − 55

40–49

Early

344

324–364

 − 53

Late

1731

1654–1804

134

Elevated

391

369–413

 − 47

50–59

Early

266

251–281

 − 54

Late

1303

1243–1361

126

Elevated

303

287–320

 − 48

60–69

Early

120

114–127

 − 52

Late

495

470–518

98

Elevated

148

140–156

 − 41

70–79

Early

95

90–100

 − 43

Late

286

272–299

71

Elevated

110

104–116

 − 34

80–89

Early

57

54–61

 − 47

Late

148

141–154

36

Elevated

64

61–68

 − 41

 ≥ 90

Early

16

15–17

 − 63

Late

43

41–45

2

Elevated

18

17–19

 − 58

Total

Early

2166

2044–2290

-54

Late

10,196

9761–10,607

117

Elevated

2470

2337–2610

 − 47

  1. aEarly: counterfactual scenario of a vaccination program implemented earlier that the actual schedule; Late: counterfactual scenario of a vaccination program implemented later that the actual schedule; Elevated: counterfactual scenario if the program had been implemented faster with higher vaccination coverage among adolescents and people aged 10–59 years.
  2. bRelative change represents a comparison between the computed number and observed number (i.e., reporting coverage = 0.25).