Low prevalence of irritable bowel syndrome in primary health care in four Swedish counties

Figures & data

Table I. Descriptive statistics for all 919 954 individuals in the primary health care database.

	All patients	Patients without IBS	Patients with IBS
Number of patients	919 954 (100)	908 967 (98.8)	10 987 (1.2)
Age (years):
0–24	323 221 (35)	320 984 (35)	2 237 (20)
25–44	271 991 (30)	267 948 (30)	4 043 (37)
45–64	210 108 (23)	206 874 (23)	3 234 (29)
65–74	62 506 (7)	61 563 (7)	943 (9)
75–84	40 344 (4)	39 892 (4)	452 (4)
85+	11 110 (1)	11 038 (1)	72 (1)
Male	430 759 (47)	427 560 (47)	3 199 (29)
Number of GP visits:
1–2	270 724 (29)	270 020 (30)	704 (6)
3–5	217 744 (24)	216 373 (24)	1 371 (12)
6+	431 486 (47)	422 574 (46)	8 912 (81)
Depression (F32, F33, F412)	44 992 (5)	43 345 (5)	1 647 (15)
Lower urinary tract symptoms (R30)	3 257 (0.4)	3 154 (0.4)	103 (1)
Migraine (G43)	12 047 (1)	11 659 (1)	388 (4)
Headache (R519, G442)	8 699 (1)	8 315 (1)	384 (4)

Note: Data are presented as n (%).

Figure 1. Age distribution of individuals with IBS (n = 10 987).

Table II. Results from logistic regression analysis of odds of IBS using data for the 919 954 individuals in the primary health care database.

	Model A	Models B1–B5	Model C
Gender (male vs. female)	0.47 (0.45–0.49)	–	0.54 (0.52–0.58)
Age (years):
0–24	1 (Ref)	–	1 (Ref)
25–44	2.12 (2.02–2.24)	–	1.85 (1.75–1.95)
45–64	2.23 (2.11–2.35)	–	1.61 (1.52–1.70)
65–74	2.16 (2.00–2.33)	–	1.39 (1.28–1.50)
75–84	1.52 (1.38–1.69)	–	0.93 (0.84–1.03)
85+	0.82 (0.65–1.04)	–	0.56 (0.44–0.70)
Number of GP visits:
1–2	–	1 (Ref)	1 (Ref)
3–5	–	2.41 (2.20–2.64)	2.36 (2.16–2.59)
6+	–	7.65 (7.08–8.26)	6.91 (6.39–7.47)
Depression (F32, F33, F412)	–	2.76 (2.61–2.91)	1.81 (1.71–1.91)
Lower urinary tract symptoms (R30)	–	2.54 (2.08–3.09)	1.79 (1.47–2.19)
Migraine (G43)	–	2.15 (1.94–2.39)	1.34 (1.21–1.49)
Headache (R519, G442) (males)	–	4.50 (3.58–5.65)	2.76 (2.19–3.47)
Headache (R519, G442) (females)	–	2.95 (2.63–3.33)	1.79 (1.59–2.02)

Notes: Data are presented as OR (95% CI) for diagnosis of IBS. In model A, only age and gender were included. In the B models (B1–B5), associations of IBS with number of GP visits and different comorbidities were analysed. Gender and age were controlled for in all B models. In model B1, the association between number of GP visits and IBS was studied. Models B2–B5 analysed the associations of IBS with different comorbidities. In model C, gender, age, number of GP visits, and comorbidities were included.