Table.

Subgroup analysis based on sex, age, and orthodontic treatment duration.

Parameter	Subgroup	Absence of Desulfovibrio genus (N)	Presence Desulfovibrio genus (N)	χ2 value	P value
Sex	Male	31	5	1.90	.167
	Female	24	9
Age group (years)	10–14	10	2	0.79	.85
	15–19	23	6
	20–24	18	4
	>25	4	2
Months into orthodontic treatment	<10	4	1	1.17	.88
	10–19	31	6
	20–29	13	4
	30–39	4	2
	>40	3	1