Table 2. Patients characteristics and its relation to unstimulated whole salivary flow rate (UWSFR) .

Variables		Number (%)	UWSFR (ml/min)
			Mean (SD)	Range	P value*
Gender	Male	110 (45.1)	0.44 (0.24)	0.10 - 1.30	0.16
	Female	134 (54.9)	0.48 (0.26)	0.12 - 1.60
Age (year)	15 - 19	32 (13.1)	0.71 (0.32)	0.20 - 1.30	< 0.001
	20 - 29	106 (43.4)	0.47 (0.25)	0.12 - 1.60
	30 - 39	32 (13.1)	0.41 (0.17)	0.20 - 0.82
	40 - 49	28 (11.5)	0.41 (0.17)	0.10 - 0.72
	50 - 59	29 (11.9)	0.37 (0.15)	0.18 - 0.78
	≥ 60	17 (7.0)	0.30 (0.15)	0.12 - 0.50
Smoking	Non-smoker	175 (71.7)	0.47 (0.25)	0.12 - 1.60	0.45
	Smoker	69 (28.3)	0.44 (0.25)	0.10 - 1.24
Alcohol	No	238 (97.5)	0.47 (0.25)	1.00 - 1.60	0.20
	Yes	6 (2.5)	0.33 (0.12)	0.20 - 0.50
Height (m)	< 1.6	20 (8.2)	0.49 (0.33)	0.20 - 1.60	0.25
	1.6 - 1.69	95 (38.9)	0.47 (0.24)	0.12 - 1.24
	1.7 - 1.79	73 (29.9)	0.44 (0.22)	0.12 - 1.10
	≥ 1.8	31 (12.7)	0.54 (0.30)	0.10 - 1.30
	Missing data	25 (10.2)
Weight (kg)	< 60	74 (30.3)	0.51 (0.27)	0.12 - 1.60	0.10
	60 - 79	87 (35.7)	0.47 (0.26)	0.12 - 1.30
	≥ 80	59 (24.2)	0.42 (0.21)	0.10 - 1.00
	Missing data	24 (9.8)
BMI¶	Underweight	12 (4.9)	0.59 (0.39)	0.20 - 1.60	0.007
	Normal weight	134 (54.9)	0.50 (0.28)	0.12 - 1.30
	Overweight	53 (21.7)	0.41 (0.22)	0.10 - 1.24
	Obese	20 (8.2)	0.35 (0.14)	0.12 - 0.60
	Missing data	25 (10.2)

*P value of Student’s t test or ANOVA, BMI¶: underweight < 18.5 kg/m², normal weight 18.5-24.9 kg/m², overweight 25-29.9 kg/m², obese ≥ 30 kg/m².