Table 1

Population characteristics: total number (%) of 1 663 6913 Japanese patients with a physician’s diagnosis of influenza infection between 2012 and 2016, in health insurance administrative data

Sex, n (%)MenWomen
8 885 699 (53.4)7 751 214 (46.6)
Patient status, n (%)OutpatientInpatient
16 488 970 (99.0)164 394 (1.0)
Age, years0–12–56–1213–1819–4445–6465–74
n (%)823 875 (5.1)2 886 462 (17.7)4 193 137 (25.7)1 480 030 (9.1)3 815 970 (23.4)2 872 125 (17.6)231 120 (1.4)
Hospital beds, n0–1920–99100–199200–299300–499500+
Patients, n (%)13 572 391 (83.3)392 179 (2.4)450 850 (2.8)324 418 (2.0)616 989 (3.8)945 892 (5.8)
Clinical department of diagnosisInternal medicinePaediatricsOtorhinolaryngologyOrthopaedicsDermatologySurgeryOphthalmologyObstetrics and gynaecologyPsychiatry
Patients, n (%)1 187 638 (32.4)827 942 (22.6)310 514 (8.5)308 146 (8.4)250 737 (6.8)206 763 (5.6)165 915 (4.5)156 615 (4.3)99 624 (2.7)