Table 1. Characteristics of the study population stratified according to gender.

Parameters	Total (n=268)	Males (n=150)	Females (n=118)	P-value*	Adjusted P-value†
Dental characteristics (%)
Plaque	33.3±21.1 (0.0–100.0)	37.9±21.5 (1.2–100.0)	27.3±19.1 (0.0–90.5)	<0.001
BOMP	20.1±12.4 (1.2–64.3)	21.2±13.3 (1.2–64.3)	18.6±11.1 (1.2–52.4)	0.081
Counts (× 106)
oPMNs‡	1.1±0.9 (0.07–7.7)	1.2±1.0 (0.07–7.7)	1.0±0.7 (0.09–4.1)	0.015	0.231
cPMNs§	8.4±6.2 (0.9–82.0)	7.5±6.7 (0.9–82.0)	9.5±5.3 (1.1–32.8)	0.008	0.042

BOMP, bleeding on marginal probing; cPMN, circulatory polymorphonuclear neutrophils; oPMN, oral polymorphonuclear neutrophils.

Results for dental characteristics and counts of oPMNs and cPMNs. Values represent means±standard deviations (range).

^*Independent t-tests, P-values≤0.007 were considered statistically significant and are shown in bold.

^†Multivariate analysis of covariance, using donor gender as a fixed factor and participant age, mean plaque and BOMP scores as covariates. Adjusted P-values≤0.007 were considered statistically significant.

^‡Total oPMNs collected after 4 × 30 s rinsing with 4.5-min intermission, after the isolation and purification steps.

^§Total cPMNs obtained from a 6 mL tube of blood, after the isolation and purification steps.