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Table 1 Serial interval by location, age of primary and secondary case and restriction level

From: Estimation of the serial interval and proportion of pre-symptomatic transmission events of COVID− 19 in Ireland using contact tracing data

  Median Serial Interval Mean Serial Interval (95% confidence intervals) Standard deviation Interquartile Range Number of transmission events
Location
 Dublin 4 3.9 (3.4, 4.4) 3.0 3 137
 Rest of Country 4 4.0 (3.7, 4.4) 3.0 4 296
Age of primary case
 0–18 4 3.4 (1.7, 5.1) 3.6 4 17
 18–25 4 4.4 (3.7, 5.1) 2.9 3 65
 25–40 4 4.3 (3.8, 4.7) 2.8 3 141
 40–65 4 3.9 (3.4, 4.4) 3.1 4 170
 ≥ 65 3 2.9 (1.9, 3.8) 3.0 4 40
Age of secondary case
 0–18 4 4.6 (3.7, 5.5) 3.3 5 50
 18–25 3 3.9 (3.1, 4.6) 3.1 4 60
 25–40 4 4.4 (3.8, 4.9) 3.0 2 121
 40–65 4 3.7 (3.3, 4.2) 2.9 3 160
 ≥ 65 3 3.3 (2.4, 4.2) 3.0 3 42
Restriction level
 Regional restrictions 4 3.9 (3.3, 4.5) 3.1 3.5 111
 Stay at home phase: Start of study period (11th April 2020) to 5th May 2020 4 4.1 (3.3, 4.9) 3.3 3 61
 National level 3: 6th October 2020 to 15th October 2020
And
1st December 2020 to End of study period (13th December 2020)
4 4.1 (3.6, 4.6) 2.8 4 128
 National level 5: 21st October 2020 to 1st December 2020 3 3.9 (3.4, 4.4) 3.0 4 133