. 2015 Apr 8;33(15):1797–1801. doi: 10.1016/j.vaccine.2015.02.039

Table 1.

The rate of decay, mean duration and Half-life for different categories of infants in a Kilifi Birth Cohort.

Category	Rate of decay(log₂PRNT/month)	Mean duration in days	Half-life in days
Overall	−0.58	52	36
Within epidemic	−0.56	54	37
Outside epidemic	−0.67	45	31
<4months	−0.64	47	32
>4months	−0.51	59	41