Haisman-Welsh Robyn J, Thomson W Murray
Ministry of Health, Wellington.
N Z Dent J. 2012 Dec;108(4):134-8.
To determine whether the prevalence of periodontitis in New Zealand adults changed between 1988 and 2009, and, if changes did occur, to determine the nature of any sex differences in those changes.
Secondary analysis of data from national oral health surveys conducted in 1988 and 2009.
Computation of CPITN-equivalent estimates from the 2009 data, in order to enable direct comparison with the 1988 estimates. The statistical significance of any observed changes was determined by examining for overlapping 95% confidence intervals.
For CPITN scores 3 and 4 ("any pocketing"), there was no change in the 20-24 age group, but significant decreases in the 35-44 and 65-74 age groups were observed. Among males, there was a slight increase in the 20-24 age group, and substantial decreases in the 35-44 and 65-74 age groups. Among females, there was a slight increase in the 20-24 age group, and substantial, statistically significant decreases in the 35-44 and 65-74 age groups.
There have been significant reductions in the prevalence of periodontitis among people aged 35-44 and 65-74 years over two decades in New Zealand (and most notably among women), but no such reductions were observed among those aged 20-24 years.
确定1988年至2009年间新西兰成年人牙周炎患病率是否发生变化，若有变化，确定这些变化中性别差异的性质。
对1988年和2009年全国口腔健康调查数据进行二次分析。
根据2009年数据计算社区牙周指数（CPITN）等效估计值，以便与1988年的估计值进行直接比较。通过检查95%置信区间是否重叠来确定任何观察到的变化的统计学显著性。
对于CPITN评分为3和4（“有牙周袋”）的情况，20 - 24岁年龄组患病率无变化，但35 - 44岁和65 - 74岁年龄组患病率显著下降。男性中，20 - 24岁年龄组患病率略有上升，35 - 44岁和65 - 74岁年龄组患病率大幅下降。女性中，20 - 24岁年龄组患病率略有上升，35 - 44岁和65 - 74岁年龄组患病率大幅下降且具有统计学显著性。
在过去二十年中，新西兰35 - 44岁和65 - 74岁人群（尤其是女性）的牙周炎患病率显著降低，但20 - 24岁人群中未观察到此类降低。
