Usefulness of primary care electronic networks to assess the incidence of chlamydia, diagnosed by general practitioners

Table 2 Use of ICPC code in different GP networks for patients identified in our study as having a chlamydia diagnosis

Reported ICPC codes	Explanation code	AMC 2007% (N = 164, 49 men; 115 women)	VUmc 2007% (N = 141, 55 men; 86 women)	IPCI 2005% (N = 189, 80 men; 109 women)	LINH 2007% (N = 485, 229 men; 256 women)
No code	Verified in free text and in laboratory results	43	7.1	42.9	0
X74.00	PID	2.4	2.1	2.6	10.5
X74.04
X74.01	PID by chlamydia	-	8.5	-	2.7
X74.05	Other pelvic infection	-	-	2.1	-
X84.00	Vaginitis	1.8	-	2.1	10.5
X84.01	Vaginitis by chlamydia	17.7	10.6	-	12.2
X85.00	Cervicitis	0.6	-	5.3	3.3
X85.01*	Cervicitis by chlamydia	15.9	19.9	5.3	13
X85.04	Other cervical disease	-	-	0.5	-
X99.00	Genital disease or sexually transmitted infection in women	1.2	16.3	14.8	-
X99.03
X99.05
Y74.00	Orchitis/Epididymitis	0.6	-	1.1	16.7
Y74.01
Y74.02
Y99.00	Genital disease or sexually transmitted infection in men	1.8	-	23.3	7.8
Y99.01
Y99.05
Y99.06
Y99.03	Genital disease by chlamydia in men	14	35.5	-	22.9
Y99.07	Unknown code	-	-	-	0.4
Total		100	100	100	100

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