Table 3.

CRP levels in group I, group II, and group III subjects (before and after periodontal therapy) with normal (term) and preterm delivery (t-test)

CRP	N	Mean ± SD	Std.error mean	Mean difference	95% CI of the difference	t	P value
Group I
Term	25	0.674 ± 0.113	0.023				0.000
Preterm	5	0.912 ± 0.697	0.031	−0.238	−0.346, −0.129	−4.49	(<.001)
Group II
Term	11	1.037 ± 0.238	0.071	−0.263
Preterm	19	1.300 ± 0.201	0.046		−0.430, −0.096	−3.22	0.003
Group III
Term	21	1.212 ± 0.255	0.055
Preterm (Before treatment)	9	1.25 ± 0.248	0.082	−0.045	−0.252, 0.161	−454	0.65
Group IV
Term	21	0.781 ± 0.162	0.035
Preterm (After treatment)	9	0.995 ± 0.167	0.055	−0.214	−0.348, −0.080	−3.29	0.003

CI: Confidence interval