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Table 3 Assessment of whether number and level of contacts mediate the effect of quarantine on secondary cases.

From: Quantifying the impact of community quarantine on SARS transmission in Ontario: estimation of secondary case count difference and number needed to quarantine

Term in adjusted model* (contrasts with crude model B, in Table 2) Secondary Case Count Ratio (SCCR) p-value under large sample assumption and using bootstrapped variance estimate (in italics) 95% confidence interval under large sample assumption and using bootstrapped variance estimate (in italics)
    Lower limit Upper limit
   Quarantine (v. no) 0.3524498 0.046
0.550
0.1266103
0.0048919
0.9811279
20.14694
   Total contacts (continuous†) 0.9999988 0.657
0.090
0.9999937
0.9999816
1.000004
1.000017
   Total close contacts (continuous) 1.061969 0.005
0.009
1.018544
1.015351
1.107246
1.107246
  1. * Poisson regression for secondary case count, adjusting for total and close contacts.
  2. †Continuous term transformed by taking the square root of raw data; used to achieve normally-distributed residuals.