Table 3 Frequency, incidence, and rates of risk of caries-affected children/surfaces
From: A longitudinal study of early childhood caries incidence in Wenzhou preschool children
Observation period (years) | ||
|---|---|---|
2011–2012 | 2012–2013 | |
N (persons) | 423 | 538 |
Number of new caries-affected children | 51 | 22 |
Person-years of observation | 172 | 149 |
IDp/100 persons at risk | 29.7 | 14.8 |
N (surfaces) | 35464 | 47344 |
Number of new caries-affected surface | 1967 | 1130 |
Surface-years of observation | 33374 | 42309 |
IDs/100 surface at risk | 5.9 | 2.7 |