Table 1 Proportion of contacts and meeting time, and proportion of tuberculosis cases resulting from transmission between household, repeated, and non-repeated contacts.

From: An explanation for the low proportion of tuberculosis that results from transmission between household and known social contacts

   Empirical data Model results, no variation in susceptibility or infectiousness Model results, fitted to empirical estimate of k (95% confidence interval for k)
Proportion of contacts (per day) Proportion of meeting time High casual transmission Medium casual transmission Low casual transmission High casual transmission Medium casual transmission Low casual transmission
Household   20.4% 36.0% 21.2% 28.6% 37.1% 12.6% (7.87%-19.3%) 14.6% (8.78%-23.2%) 16.5% (9.87%-26.4%)
Repeated Daily 5.14% 5.76% 3.99% 5.92% 8.68% 2.51% (1.59%-3.68%) 3.12% (1.85%-4.85%) 3.81% (2.20%-6.11%)
Weekly-monthly 8.12% 6.82% 6.15% 10.1% 17.1% 5.65% (4.65%-6.22%) 8.48% (6.46%-9.92%) 12.7% (8.92%-16.1%)
Overall 13.3% 12.7% 10.1% 16.0% 25.7% 8.16% (6.24%-9.90%) 11.6% (8.30%-14.8%) 16.5% (11.1%-22.2%)
Non-repeated Non-repeated close 1.21% 0.678% 0.918% 1.45% 2.36% 1.06% (1.14%-0.95%) 1.92% (2.16%-1.61%) 4.11% (4.60%-3.22%)
Non-repeated casual 63.5% 49.4% 67.8% 54.0% 34.8% 78.2% (84.8%-69.9%) 71.9% (80.8%-60.4%) 62.9% (74.4%-48.2%)
Overall 66.4% 51.3% 68.7% 55.4% 37.2% 79.3% (85.9%-70.8%) 73.8% (82.9%-62.0%) 67.0% (79.0%-51.4%)