Increased prescriptions for irritable bowel syndrome after the 2018 Japan Floods: a longitudinal analysis based on the Japanese National Database of Health Insurance Claims and Specific Health Checkups

Table 3 Occurrence of Prescriptions for IBS drugs After the Disaster Among Non-users

	Victims	Non-victims	Crude OR (95% CI)	Adjusted OR (95% CI)	PI
	n (%)	n (%)	Crude OR (95% CI)	Adjusted OR (95% CI)	PI
Non-uses (n = 5,254,540)	241 (0.75)	19,129 (0.37)	2.05 (1.8–2.33)	2.08 (1.84–2.37) ^*
Subgroup
Gender
Male (n = 2,447,467)	86 (0.81)	9009 (0.37)	1.66 (1.34–2.05)	1.65 (1.34–2.05) ^†	0.01^§
Female (n = 2,807,073)	155 (0.85)	10,120 (0.36)	2.36 (2.01–2.77)	2.44 (2.08–2.86) ^†	–
Age group
< 65 (n = 3,455,844)	122 (0.76)	12,868 (0.37)	2.05 (1.71–2.46)	2.04 (1.71–2.45)^‡	0.73^¶
\(\ge\) 65 (n = 1,798,696)	119 (0.73)	6261 (0.35)	2.09 (1.74–2.51)	2.09 (1.74–2.5)^‡	–

IBS: irritable bowel syndrome; OR: odds ratio; CI: confidence interval; PI: P value for interaction
*OR was evaluated with a logistic regression analysis adjusted for gender and age group
^†OR was evaluated with a logistic regression analysis adjusted for age group
^‡OR was evaluated with a logistic regression analysis adjusted for gender
^§PI between gender (male versus female) and victim status
^¶PI between age group (< 65 vs \(\ge\) 65) and victim status

ISSN: 1471-230X