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Table 1

Statistics of SI re-estimated (in bold) from raw data of publications that do not or partly provide mean and/or SD and/or statistical distribution.

Values used from raw data of the publication
Author SD N. pairs Distr.
Bohmer et al. [19] 3.94 1.75 15 W
Cereda et al. [20] 6.64 4.67 90 γ
He et al. [21] 5.80 → 5.95a 3.78 77 γ
Huang et al. [22] 2.36 b 1.60 5 Log-N
Ki et al. [23] 6.60 → 4.94c 3.46 9 Log-N
Liao et al. [24] 6.50 → 8.22d 2.22 9 Ν
Lu et al. [25] 5.96 3.58 265 W
Mettler et al. [26] 3.43 4.17 102 N
Tindale et al. [27] 4.17 → 5.96a 2.96 56 γ
Tindale et al. [27] 4.31 → 5.96a 3.18 72 γ
Wang et al. [28] 7.60 → 7.85a 5.43 76 γ
Zhang et al. [29] 5.10 → 5.15a 2.70 35 γ
De Laval et al. [30] 5.34 5.07 23 Log-N
Pung et al. [31] 4.97 4.23 63 N
Zhu et al. [32] 6.60 5.11 74 γ

: mean of SI, SD: standard deviation, N. pairs: number of infector/infected pairs, Distr.: statistical distribution, NA: not available parameter estimated from raw data, γ: gamma distribution, W: Weibull, N: Normal, Log-N: log-normal.

a

After removing negative and null values and fitting a gamma distribution.

b

After removing null values and fitting a log-normal distribution.

c

After removing three pairs with date of symptom onset was uncertain and fitting a log-normal distribution.

d

After removing null values and fitting a normal distribution.