Table 2

Dental plaque index (PLI), at baseline examination in 1985 for the 1390 subjects who were alive and dead from 1996 to 2009

Alive (n)Dead (n)PLI alivePLI deadp Value
19961371160.67± (0.47 SD)0.84± (0.58 SD)NS
19981364230.66± (0.47 SD)0.87± (0.54 SD)<0.05
20001367230.66± (0.46 SD)0.87± (0.54 SD)<0.05
20011359310.66± (0.47 SD)0.91± (0.54 SD)<0.01
20091332580.66± (0.46 SD)0.87± (0.62 SD)0.001