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Table 1 Characteristics of the 9th grade students attending public and private schools in Brazil, 2012

From: Involvement of school students in fights with weapons: prevalence and associated factors in Brazil

  Total  
Variables % 95 % CI
Sociodemographic characteristics
 Sex
  Female 52.16 (51.69–52.62)
  Male 47.84 (47.38–48.31)
 Age group
   < 11 0.00 (0.00–0.10)
  12 0.73 (0.66–0.81)
  13 22.13 (21.73–22.54)
  14 45.55 (45.08–46.02)
  15 18.35 (18.00–18.71)
  16 8.37 (8.13–8.63)
  17 3.19 (3.03–3.35)
  18 0.97 (0.89–1.15)
   ≥ 19 0.67 (0.61–0.74)
 Ethnicity/skin color
  White 36.78 (36.32–37.23)
  Black 13.36 (13.03–13.69)
  Yellow 4.10 (3.92–4.28)
  Brown 42.24 (41.78–42.71)
  Indigenous 3.53 (3.36–3.70)
 Type of school
  Private 17.2 (16.8–17.5)
  Public 82.8 (82.5–83.2)
 Employment
  No 86.86 (86.54–87.16)
  Yes 13.14 (12.84–13.46)
Health–risk behaviors
 Cigarette smoking in the previous 30 days
  No 94.93 (94.71–95.14)
  Yes 5.07 (4,86–5.29)
 Alcohol intake in the previous 30 days
  No 73.91 (73.49–74.32)
  Yes 26.09 (25.68–26.51)
 Use of illicit drugs
  No 97.60 (97.44–97.74)
  Yes 2.40 (2.26–2.56)
Mental Health
 Insomnia
  No 90.30 (90.01–90.58)
  Yes 9.70 (9.42–9.99)
 Close friends
  One or more 96.50 (96.32–96.67)
  None 3.50 (3.33–3.68)
Parental supervision
 Living with mother and/or father
  Yes 94.60 (94.40–94.80)
  No 5.40 (5.20–5.60)
 Skipping classes without permission
  No 74.19 (73.76–74.61)
  Yes 25.81 (25.39–26.24)
Context of violence
 Suffering family violence
  No 89.40 (89.10–89.69)
  Yes 10.60 (10.31–10.90)
 Suffering bullying
  No 92.83 (92.58–93.08)
  Yes 7.17 (6.92–7.42)
 Unsafe on the way to and from and/or at school
  No 87.86 (87.5–88.2)
  Yes 12.14 (11.8–12.5)
  1. 95 % CI 95 % confidence interval