Table 4.

Comparing children living in the house of a tuberculosis case 3 years before exposure starts

Age months	Exposed deaths/PYO	Unexposed deaths/PYO	MRR
3–11	6/151	286/5849	0.82 (0.4 to 1.8)
12–35	20/679	357/14020	1.20 (0.8 to 1.9)
36–60	7/710	127/11547	0.90 (0.4 to 1.9)
All	33/1540	770/31418	1.04 (0.7 to 1.5)

The period is from July 2002 to June 2005.

MRR from a model with age as underlying time.

MRR, mortality rate ratio; PYO, person-years of observation.