TABLE 1.

Factors that affect DNA yield from the early positive MGIT cultures

Factor	Impact on DNA yield (ng/μl)	P	95% CIa
Age of MGIT culture, per additional day	0.131	0.01	−0.233 to 0.029
Heat inactivation time, 2 h versus 30 min	−0.838	0.01	−1.486 to −0.191
Speed of growth, slow versus fast	0.994	0.03	−1.901 to 0.087

^aCI, confidence interval.