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Table 2

Characteristics description of the 90 SI estimates.

  N = 90 %
Countries
 China 32 35.6
 South Korea 12 13.3
 Other Asian countries 21 23.3
 European countries 15 16.7
 Other countries 10 11.1
Variants
 Alpha 75 83.3
 Delta 8 8.9
 Omicron 7 7.8
SI with negative values  
 Yes 42 46.7
 No 30 33.3
 NA 18 20.0
Statistical distribution  
 Gamma 33 36.7
 Normal 30 33.3
 Weibull 8 8.9
 Log-N 11 12.2
 NA 8 8.9
SI estimated from  
 Direct published data 75 83.3
 Raw data 15 16.7

SI: Serial interval; Gamma: Gamma distribution; Normal: Normal distribution; Weibull: Weibull distribution; Log-N: Log-normal distribution; NA: Not available.