Table 1.

Crude prevalence and extent values (%) according to varying thresholds for attachment loss (AL) and probing depth (PD) for 55–81-year-old subjects from SHIP and INVEST (all subjects and Whites only) using half-mouth protocols with four sites.

	SHIP	INVEST	INVEST Whites
N-AL/N-PD	1182/1317	756/775	127/133
Prevalence of subjects with, %
AL≥4 mm	94.4 (0.7)	89.9 (1.1) *	83.5 (3.3) *
AL≥5 mm	85.1 (1.0)	73.3 (1.6) *	63.0 (4.3) *
AL≥6 mm	69.8 (1.3)	55.0 (1.8) *	49.6 (4.5) *
Mean percentage of sites/subject with, %
AL≥4 mm	51.4 (1.0)	31.2 (1.0) *	23.9 (2.1) *
AL≥5 mm	35.4 (0.9)	18.9 (0.9) *	12.9 (1.7) *
AL≥6 mm	23.6 (0.9)	10.1 (0.6) *	6.6 (1.1) *
Mean AL, mm	4.0 (0.06)	2.9 (0.06) *	2.5 (0.11) *
Mean AL, mm #	3.8 (0.05)	2.9 (0.06) *	2.5 (0.11) *
Prevalence of subjects with, %
PD≥4 mm	78.1 (1.1)	61.5 (1.7) *	59.4 (4.3) *
PD≥5 mm	54.0 (1.4)	39.1 (1.8) *	30.1 (4.0) *
PD≥6 mm	35.7 (1.3)	16.6 (1.3) *	12.0 (2.8) *
Mean percentage of sites/subject with, %
PD≥4 mm	18.2 (0.6)	10.9 (0.6) *	6.5 (0.9) *
PD≥5 mm	9.5 (0.4)	5.4 (0.4) *	2.5 (0.7) *
PD≥6 mm	5.4 (0.3)	1.5 (0.2) *	1.0 (0.5) *
Mean PD, mm	2.8 (0.02)	2.3 (0.03) *	2.2 (0.05) *
Mean PD, mm #	2.6 (0.02)	2.3 (0.03) *	2.2 (0.05) *
CDC/AAP classification, %
No or mild	22.3 (1.2)	34.6 (1.8)	42.1 (4.4)
Moderate	45.5 (1.5)	48.6 (1.8)	43.7 (4.4)
Severe	32.2 (1.4)	16.8 (1.4) *	14.3 (3.1) *
Tooth count, incl. edentulous subjects †	10.6 (0.2)	14.4 (0.3) *	19.0 (0.8) *
Tooth count, dentates †	14.3 (0.2)	17.4 (0.3) *	21.1 (0.6) *
Edentulous, % †	25.8 (1.0)	17.3 (1.2) *	10.1 (2.5) *
BOP, %	43.3 (1.2)	28.5 (1.1) *	22.1 (2.6) *

Data are presented as Mean (SE) or percentage (SE).

N-AL, number of subjects with available attachment loss data; N-PD, number of subjects with available probing depth data; BOP, Bleeding on probing.

^*p<0.05 for Mann-Whitney-U-test or Chi-square test comparing SHIP with INVEST or INVEST Whites.

^#probe corrected for SHIP

^†including all subjects with dental data