Denise Li-Meng Goh*
, Bee Wah Lee*, Kee Seng Chia*, Bee Hoon Heng†, Mark Chen‡, Stefan Ma§, and Chorh Chuan Tan§
Figure. Survival analysis for secondary household transmission (Cox regression model). Household contacts were more likely to get SARS if the index was older or a nonhealthcare worker. Hazard ratios of risk factors analyzed are tabulated in Table 2. The -2log likelihood for this analysis was 253.77. HH, household; HCW, healthcare worker; NHCW, nonhealthcare worker.