Table 2

NPI usage and camper and staff number and COVID-19 cases

NPI		Total number*		No with/of confirmed cases			Risk ratio (95% CI)†
NPI		Camps	Campers‡	Camps	Campers	Staff	Campers	Staff
Pre-camp quarantine at home
Campers	Yes	97	26 311	17	16	40	2.82 (1.36, 5.86)^**	2.86 (1.80, 4.55)^***
	No	285	60 254	54	13	32
	Missing	104
Staff	Yes	103	25 701	16	16	39	3.07 (1.45, 6.49)^**	2.81 (1.76, 4.48)^***
	No	278	59 196	53	12	32
	Missing	105
Pre-camp quarantine at camp
Campers	Yes	18	7580	7	0	7	0.00 (0.00, -)	1.07 (0.49, 2.34)
	No	337	72 038	59	27	62
	Missing	131
Staff	Yes	73	25 151	10	9	26	1.18 (0.53, 2.62)	1.39 (0.86, 2.26)
	No	293	59 225	57	18	44
	Missing	120
Facial coverings
Campers	Always	126	30 883	13	5	6	0.36 (0.14, 0.95)^**	0.17 (0.08, 0.40)^***
	Not always	255	56 176	59	25	63
	Missing	105
Staff	Always	268	60 682	56	14	33	0.39 (0.19, 0.80)^**	0.38 (0.24, 0.60)^***
	Not always	122	27 117	18	16	38
	Missing	96
Decreased capacity
	Always	326	56 838	63	24	63	1.44 (0.59, 3.52)	3.77 (1.63, 8.72)^**
	Not always	39	20 429	9	6	6
	Missing	121
Physical distancing
	Always	257	57 183	56	11	40	0.31 (0.15, 0.65)^**	0.67 (0.42, 1.07)
	Not always	133	30 616	18	19	32
	Missing	96
Use of cohorts, pods, bubbles
	Always	301	63 501	65	18	48	0.39 (0.19, 0.82)^**	0.63 (0.37, 1.06)
	Not always	49	16 653	6	12	20
	Missing	136
Modified programmes to allow for physical distancing
	Always	292	61 289	59	13	59	0.30 (0.15, 0.61)^**	0.52 (0.32, 0.82)^**
	Not always	91	23 895	15	17	31
	Missing	103
Decreased visitors, including parents
	Always	308	70 896	70	27	68	1.39 (0.42, 4.57)	2.62 (0.96, 7.18)
	Sometimes	47	10 922	4	3	4
	Missing	131
Increased cleaning frequency
	Always	371	80 997	69	27	69	0.71 (0.21, 2.33)	2.71 (0.66, 11.03)
	Not always	18	6352	4	3	2
	Missing	97
Regular hand hygiene
	Always	374	81 247	71	27	71	0.72 (0.22, 2.37)	5.68 (0.79, 40.87)
	Not always	15	6499	3	3	1
	Missing	97
Altered dining to decrease numbers or increase physical distancing
	Always	257	65 365	60	23	60	0.24 (0.09, 0.63)^**	1.57 (0.38, 6.40)
	Not always	24	3411	4	5	2
	Missing	205
Changed or increased bathroom facilities
	Always	160	39 463	31	7	31	0.34 (0.15, 0.80)^**	0.90 (0.56, 1.47)
	Not always	139	40 301	19	21	35
	Missing	187

^**p<0.05; ^***p<0.001
*Does not include camps that did not report data for examined NPI.
†Risk ratio for always versus not always. Risk ratios for staffers determined using number of campers as denominator.
‡Number of campers estimated from unique number of on-site campers.
NPI, non-pharmaceutical intervention.