Table 3

Effect of multiple NPI combinations on total (camper and staff) COVID-19 cases*

NPIResponseNumberNumber of casesRR (95% CI)
CampsCampersCampsCampersStaffCampersStaff
Camper and staff facial coveringNeither11826 589181639
Camper facial covering only00000
Staff facial covering only13729 587419240.51 (0.22 to 1.14)0.55 (0.33 to 0.92)
Both12630 88313560.27 (0.10 to 0.73)0.13 (0.06 to 0.31)
Camper facial covering and home camper quarantineNeither19542 087471129
Camper facial covering only8717 5476220.44 (0.10 to 1.97)0.17 (0.04 to 0.69)
Home camper quarantine only5614 0291214343.82 (1.73 to 8.41)3.52 (2.14 to 5.77)
Both3410 7864240.71 (0.16 to 3.20)0.54 (0.19 to 1.53)
Camper facial covering and physical distancingNeither11025 477171832
Camper facial covering only2150191100.28 (0.04 to 2.11)0.00 (0.00 to NA)
Physical distancing only14530 699427310.32 (0.13 to 0.77)0.80 (0.49 to 1.32)
Both10525 86412460.22 (0.07 to 0.65)0.18 (0.08 to 0.44)
Camper facial coverings and modified programmesNeither8523 113151731
Camper facial coverings only46620000.00 (0.00 to NA)0.00 (0.00 to NA)
Modified programmes only16731 384448320.35 (0.15 to 0.80)0.76 (0.46 to 1.25)
Both12029 28513560.23 (0.09 to 0.63)0.15 (0.06 to 0.37)
Physical distancing and modified programmesNeither7919 504141730
Physical distancing only1243911010.00 (0.00 to NA)0.15 (0.02 to 1.09)
Modified programmes only5411 1124220.21 (0.05 to 0.89)0.12 (0.03 to 0.49)
Both23850 1775511390.25 (0.12 to 0.54)0.51 (0.31 to 0.81)
Physical distancing and home camper quarantineNeither9921 6891048
Physical distancing only18638 565449241.27 (0.39 to 4.11)1.69 (0.76 to 3.75)
Home camper quarantine only328807815249.24 (3.07 to 27.82)7.39 (3.32 to16.44)
Both6116 00891160.34 (0.04 to 3.03)2.71 (1.16 to 6.33)
Modified programmes and home camper quarantineNeither7016 9151039
Modified programmes only21240 7244410231.38 (0.38 to 5.03)1.06 (0.49 to 2.29)
Home camper quarantine only1968605142211.51 (3.31 to 40.03)6.03 (2.78 to 13.08)
Both7217 955122180.63 (0.10 to 3.76)1.88 (0.85 to 4.19)
  • *Comparisons made using subset of data for which there are complete data for each examined NPI. RRs calculated comparing one or two NPIs to neither NPI.

  • NPI, non-pharmaceutical intervention; RR, relative risk.