Table 4.

Summary statistics by location.

PHO reports comparison (weeks)
Group	Detection threshold	Earliest first date	Mean first date	SD first date
Airport Terminal 1 and 3	0.01	16	– 4.5238095	6.845576
Airport Terminal 1 and 3	0.05	– 16	– 4.0996785	5.435883
Pooled Aircraft Sewage	0.01	– 3	0.1111111	3.027111
Pooled Aircraft Sewage	0.05	– 3	2.7529412	4.537951
Toronto	0.01	– 1	5.5263158	5.274345
Toronto	0.05	– 1	5.3373494	4.654599
York	0.01	– 6	5.0769231	7.398891
York	0.05	– 5	11.5607477	12.604415
Peel	0.01	– 11	3.4444444	5.972705
Peel	0.05	– 10	3.3375000	9.751266

GISAID comparison (days)
Group	Detection threshold	Earliest first date	Mean first date	SD first date
Airport Terminal 1 and 3	0.01	– 59	– 1.181818	36.67102
Airport Terminal 1 and 3	0.05	– 59	3.590389	38.45018
Pooled Aircraft Sewage	0.01	– 6	21.142857	29.61511
Pooled Aircraft Sewage	0.05	– 3	55.414286	43.37450
Toronto	0.01	– 1	63.000000	46.18596
Toronto	0.05	– 1	57.378378	45.68136
York	0.01	– 3	67.500000	66.89224
York	0.05	4	114.903846	91.77870
Peel	0.01	20	57.538461	28.94712
Peel	0.05	46	119.384615	42.34794

Table showing summary statistics of first detections from all lineages across each location. Comparison to PHO reports is presented first in weeks, followed by comparison to GISAID in days. Statistics are calculated with detection thresholds of 0.01 (1%) followed by 0.05 (5%). The summaries were based only on the first detection of any lineage for each location. All dates refer to the number of weeks or days after the first clinical case, with negative values representing weeks or days before the first clinical case. The Mean first date is the mean of the first detection dates for the listed site that passed the Detection threshold listed in weeks or days after clinical detection of each lineage. The SD first date is the standard deviation of all first detection lead times. For GISAID comparison, only the 4 lineages which are searchable on GISAID were used for the calculations