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Table 1 Demographics of the study population and numbers of samples collected and pathogens isolated with regard to age group

From: Aerobic bacteria associated with chronic suppurative otitis media in Angola

Age group (years) N (%) Gender (male/female)1 Ear discharge samples Nasopharyngeal samples Total Corresponding isolates3
N Isolates2 N Isolates2 N Isolates2 Ear/Ear Ear/Nph
<  5 34 (22) 20/14 44 124 (2.8 [0–5]) 34 104 (3.1 [1–6]) 78 194 (2.5 [0–6]) 10 (18.2) 7 (10)
5–9 23 (15) 15/8 26 81 (3.1 [0–6]) 23 52 (2.3 [0–3]) 49 117 (2.4 [0–6]) 7 (36.8) 3 (8.3)
10–14 24 (16) 16/8 31 97 (3.1 [1–7]) 24 51 (2.1 [0–5]) 55 144 (2.6 [0–7]) 15 (33.3) 6 (12.8)
≥ 15 55 (36) 33/22 66 184 (2.8 [1–6]) 54 109 (2.0 [0–4]) 120 286 (2.4 [0–6]) 18 (29.5) 11 (10.8)
No age data 16 (11) 7/4 17 48 (2.8 [1–4]) 16 45 (2.8 [1–4]) 33 96 (2.9 [1–4]) 2 (28.6) 0
Total 152 91/56 1844 534 (2.9 [0–7]) 1515 361 (2.4 [0–6]) 335 823 (2.5 [0–7]) 52 (27.3) 27 (9.3)
  1. No data about age or gender was available for 16 and 5 patients, respectively
  2. 1 Gender data was missing for 5 patients
  3. 2 Presented as N (mean number of isolates per sample [range])
  4. 3 Number of species present in two ear discharge samples, or in samples from ear discharge and the nasopharynx, from the same patient. Presented as N (%)
  5. 4 Bilateral samples were collected from 32 patients
  6. 5 No nasopharyngeal sample was collected from 1 patient