Table 3

Description of cases defined by ‘serology strict’ and association with bivariable and multivariable analyses based on Mat-O-Covid index (continuous and categorised)

TotalNo of casesProportion (%)Crude ORs (95% CI)Adjusted ORs*, Mat-O-Covid index continuous (95% CI)Adjusted ORs*, Mat-O-Covid index categorised(95% CI
Sex
 Men68043775.54 1 1 1
 Women77585346.88 1.26 (1.10 to 1.44) 1.21 (1.02 to 1.43) 1.21 (1.02 to 1.43)
Age
 <30 years338123.55 0.45 (0.25 to 0.81) 0.47 (0.24 to 0.93) 0.46 (0.23 to 0.91)
 30–40 years34993048.69 1.17 (1.00 to 1.36) 1.14 (0.95 to 1.37) 1.13 (0.94 to 1.36)
 40–50 years53324027.54 1 1 1
 50–60 years43231543.56 0.45 (0.37 to 0.55) 0.43 (0.34 to 0.54) 0.43 (0.34 to 0.54)
 ≥60 years1070393.64 0.46 (0.33 to 0.65) 0.43 (0.28 to 0.66) 0.44 (0.28 to 0.67)
Family meeting
 No499183.61 0.55 (0.34 to 0.88) 0.48 (0.25 to 0.90)0.48 (0.25 to 0.91)
 Yes, one time955575.97 0.93 (0.70 to 1.23) 1.09 (0.78 to 1.52)1.10 (0.79 to 1.53)
 Yes, more than one time13 0628356.39 1 11
Leisure activities
 No34011955.730.89 (0.75 to 1.05)0.98 (0.80 to 1.20)0.98 (0.80 to 1.21)
 Yes, one time841556.541.02 (0.77 to 1.36)1.22 (0.87 to 1.71)1.22 (0.87 to 1.72)
 Yes, more than one time10 2716596.42111
Regular shopping
 No285165.610.88 (0.53 to 1.47)0.88 (0.47 to 1.64)0.88 (0.47 to 1.64)
 Yes, one time19784.060.63 (0.31 to 1.28)0.75 (0.35 to 1.62)0.75 (0.35 to 1.63)
 Yes, more than one time14 0278856.31111
Public places visit
 No22601135 0.74 (0.61 to 0.91) 0.86 (0.67 to 1.11)0.87 (0.68 to 1.11)
 Yes, one time19501145.85 0.88 (0.71 to 1.08) 0.80 (0.62 to 1.03)0.80 (0.62 to 1.03)
 Yes, more than one time10 3116826.61 1 11
Use o f hand sanitiser†
 No280186.43 0.96 (0.59 to 1.56) 0.94 (0.50 to 1.75) 0.94 (0.50 to 1.76)
 Yes, after almost every outing47102545.39 0.80 (0.69 to 0.93) 0.79 (0.66 to 0.95) 0.79 (0.66 to 0.95)
Yes, systematically after each outing (or I never go out)95376376.68 1 1 1
Wearing mask†
 No381215.510.97 (0.61 to 1.54)0.94 (0.54 to 1.64)0.94 (0.54 to 1.65)
 Yes, after almost every outing10 6366906.491.15 (0.98 to 1.36)1.20 (0.98 to 1.47)1.20 (0.98 to 1.47)
Yes, systematically after each outing (or I never go out)35071995.67111
Difference between questionnaire and serology
 Less than 3 months23461998.48 1 1 1
 3 months or more12 2167125.83 0.67 (0.57 to 0.79) 0.65 (0.54 to 0.79) 0.65 (0.54 to 0.79)
Mat-O-Covid Index
 Continuous variable14 5629116.26 1.01 (1.00 to 1.02) 1.01 (1.00 to 1.02)
 <13 per thousand89845606.23 1 1
 ≥13 per thousand12271038.39 1.38 (1.11 to 1.72) 1.30 (1.03 to 1.63)
  • Bold results: overall test, p <0.05.

  • *Adjusted for sex, age, family meeting, leisure activities, regular shopping, public places visit, use of hand sanitiser, wearing mask and time between questionnaires.

  • †Outside of work.