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Table 1 Demographic characteristics of enrolled children

From: Incidence of acute otitis media in children below 6 years of age seen in medical practices in five East European countries

Medical record reviewa
Characteristics   Estonia Lithuania Poland Romania Slovenia Total
N 250 300 1106 301 300 2257
Age (months) Median (range) 36 (3–71) 27.5 (0–71) 24 (0–71) 34 (2–71) 27 (1–70) 28 (0–71)
Gender, n (%) Female 122 (48.8) 154 (51.3) 554 (50.1) 139 (46.2) 157 (52.3) 1126 (49.9)
Male 128 (51.2) 146 (48.7) 552 (49.9) 162 (53.8) 143 (47.7) 1131 (50.1)
Pneumococcal vaccination (at least 1 dose), n (%) Yes 21 (8.4) 35 (11.7) 513 (46.4) 47 (15.6) 45 (15.0) 661 (29.3)
No 227 (90.8) 265 (88.3) 590 (53.3) 254 (84.4) 255 (85.0) 1591 (70.5)
Unknown 2 (0.8) 0 (−) 3 (0.3) 0 (−) 0 (−) 5 (0.2)
Child feeding, n (%) Breast-fed 14 (5.6) 62 (20.7) 193 (17.5) 26 (8.6) 32 (10.7) 327 (14.5)
Formula-fed 2 (0.8) 32 (10.7) 164 (14.8) 39 (13.0) 25 (8.3) 262 (11.6)
Regular food 243 (97.2) 245 (81.7) 837 (75.7) 259 (86.0) 269 (89.7) 1853 (82.1)
Child care/school attendance, n (%) 2–5 children 25 (10.0) 1 (0.3) 32 (2.9) 100 (33.2) 12 (4.0) 170 (7.5)
6–10 children 13 (5.2) 1 (0.3) 9 (0.8) 15 (5.0) 6 (2.0) 44 (1.9)
> 10 children 175 (70.0) 145 (48.3) 350 (31.6) 144 (47.8) 185 (61.7) 999 (44.3)
Follow-up periodb
Characteristics   Estonia Lithuania Poland Romania Slovenia Total
N 249 299 1104 301 300 2253
Age (months) Median (range) 36 (3–71) 28 (0–71) 24 (0–71) 34 (2–71) 27 (1–70) 28 (0–71)
Gender, n (%) Female 121 (48.6) 153 (51.2) 553 (50.1) 139 (46.2) 157 (52.3) 1123 (49.8)
Male 128 (51.4) 146 (48.8) 551 (49.9) 162 (53.8) 143 (47.7) 1130 (50.2)
N c 249 298 1100 300 298 2245
Pneumococcal vaccination (at least 1 dose), n (%)d Yes 14 (5.6) 15 (5.0) 200 (18.2) 15 (5.0) 11 (3.7) 255 (11.4)
No 235 (94.4) 283 (95.0) 884 (80.4) 285 (95.0) 287 (96.3) 1974 (87.9)
Unknown 0 (−) 0 (−) 16 (1.5) 0 (−) 0 (−) 16 (0.7)
  1. N total number of subjects
  2. n (%) number (percentage) of subjects in each group
  3. aOnly 1 subject from Poland was excluded from the According-To-Protocol (ATP) cohort for retrospective analysis for protocol violation
  4. b5 subjects (1 subject from Poland for protocol violation and 1 subject each from Estonia and Lithuania and 2 subjects from Poland for lost to follow-up) were excluded from the ATP cohort for prospective analysis
  5. cNumber of subjects available at study conclusion
  6. dSum of percentages may exceed 100 % due to rounding