Table 2

Risk of bacterial complications in the month after diagnosis of URTIs

	No antibiotic treatment			Treated with antibiotics
	No of episodes	No of complications	Risk per 10 000	No of episodes	No of complications	Risk per 10 000
Mastoiditis after AOM
0–4	45 473	6	1.32	243 141	23	0.95
5–14	21 294	3	1.41	88 741	13	1.46
15–64	12 676	1	0.79	93 582	9	0.96
65+	2412	0	−	7809	1	1.28
Total*	81 864	10	1.22	433 273	46	1.06
Meningitis after AOM
0–4	45 476	2	0.44	243 151	1	0.04
5–14	21 292	1	0.47	88 746	0	−
15–64	12 676	1	0.79	93 581	13	1.39
65+	2412	0	−	7808	4	5.13
Total*	81 865	4	0.49	433 286	18	0.42
Peritonsillitis after pharyngotonsillitis
0–4	20 772	4	1.93	116 785	15	1.28
5–14	44 609	57	12.8	156 170	183	11.7
15–64	157 178	663	42.2	347 424	2340	67.4
65+	9167	27	29.5	12 552	61	48.6
Total†	231 749	751	32.4	632 933	2599	41.1
Retropharyngeal and parapharyngeal abscesses after pharyngotonsillitis
0–4	20 772	0	−	116 811	2	0.17
5–14	44 585	0	−	156 332	3	0.19
15–64	156 805	24	1.53	349 240	76	2.18
65+	9154	4	4.37	12 627	9	7.13
Total†	231 339	28	1.21	635 012	90	1.42
Invasive group A streptococcal disease after pharyngotonsillitis
0–4	20 772	0	−	116 811	0	−
5–14	44 585	0	−	156 333	2	0.13
15–64	156 806	4	0.26	349 255	8	0.23
65+	9155	3	3.28	12 632	1	0.79
Total†	231 341	7	0.30	635 033	11	0.17
Orbital abscess after sinusitis
0–4	199	0	−	679	0	−
5–14	1791	1	5.58	4333	0	−
15–64	54 811	0	−	181 930	1	0.05
65+	5637	0	−	19 832	0	−
Total‡	62 441	1	0.16	206 774	1	0.05
Extradural and subdural abscesses after sinusitis
0–4	199	0	−	679	0	−
5–14	1791	0	−	4333	1	2.31
15–64	54 811	1	0.18	181 930	1	0.05
65+	5637	0	−	19 832	0	−
Total‡	62 441	1	0.16	206 774	2	0.10
Acute pansinusitis after sinusitis
0–4	198	0	−	679	0	−
5–14	1790	0	−	4330	1	2.31
15–64	54 812	7	1.28	181 923	15	0.82
65+	5637	0	−	19 832	2	1.01
Total‡	62 440	7	1.12	206 764	18	0.87
Acute ethmoidal sinusitis after sinusitis/acute URTIs of multiple and unspecified sites
0–4	419 540	39	0.93	70 887	15	2.12
5–14	208 157	21	1.01	34 173	13	3.80
15–64	778 900	4	0.05	347 041	6	0.17
65+	100 201	1	0.10	56 669	0	−
Total§	1 506 825	65	0.43	508 770	34	0.67

*Missing information on age for 9 episodes of AOM.
†Missing information on age for 25 episodes of tonsillitis.
‡Missing information on age for 3 episodes of sinusitis.
§Missing information on age for 27 episodes of sinusitis.
AOM, acute otitis media; URTI, upper respiratory tract infection.