You can find constraints well worth discussing contained in this research
First, specific people was in fact missing to follow-up (attrition price: 30%). Yet not, this might be inevitable for the longitudinal degree, particularly when children are hired of kindergartens in which attendance isn’t required inside the China and children you may get-out for change inside their parents’ circumstances. Furthermore, there had been limited differences in many years, sex, dmft directory, weight and level within baseline among those just who done the research and people who was in fact missing at the go after-up. Next, the effective use of decayed, destroyed and you can occupied counters directory (dmfs) would be regarded as far better than dmft, particularly in studies setting out in the evaluating people procedures needs. （更多…）