Table 2. Forecast properties and brier scores.

		Primary outcome	Recruitment	Completion date
		(N = 104)	(N = 281)	(N = 536)
Outcomes (N, %)
	Positivity	45 (43.3%)	120 (42.7%)	72 (13.4%)
Forecasts
	Mean	59.6%	78.8%	72.2%
	Median	66%	90%	80%
	Mode	50%	90%	80%
Extreme forecasts (N, %)
	< = 10%	16 (15.4%)	16 (5.7%)	35 (6.5%)
	> = 90%	23 (22.1%)	158 (56.2%)	180 (33.6%)
	Total	39 (37.5%)	174 (61.9%)	215 (40.1%)
Brier scores (mean, 95% bootstrap CI)
	Mean	0.25 [0.20–0.30]	0.38 [0.33–0.42]	0.52 [0.50–0.55]