Prevalence of genetic differences in phosphorylcholine expression between nontypeable Haemophilus influenzae and Haemophilus haemolyticus

Table 2 Prevalence of lic1 locus copy number and licD alleles in NT H. influenzae and H. haemolyticus

Genotype	*H. influenzae* n = 88 (%)	*H. haemolyticus* n = 109 (%)	PR^a	P value^c
lic1 copy number
0	7 (8.0)	63 (57.8)	0.14	< .0001
1	74 (84.0)	46 (42.2)	2.18	< .0001
2	7 (8.0)	0 (0)^b	ND	.0031
single licD alleles
licD_I	40 (45.5)	1 (0.92)	49.5	< .0001
licD_III	14 (15.9)	23 (21.1)	0.75	.6647
licD_IV	20 (22.7)	23 (21.1)	1.07	.3536
dual licD alleles
licD_IV-licD_III	4 (4.5)	0 (0)	ND	.0383
licD_I-licD_III	1 (1.1)	0 (0)	ND	.4467
licD_I-licD_IV	1 (1.1)	0 (0)	ND	.4467
licD_I-licD_I	1 (1.1)	0 (0)	ND	.4467

^a Prevalence ratios (PR) were calculated for H. influenzae using H. haemolyticus as the referent group.
^b Logit, 0.5 used in place of 0 for PR and statistical calculations.
^c P < 0.05 is considered statistically significant using χ² analysis.

ISSN: 1471-2180