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Table 2 Prevalence (%) of history of involvement in fights with firearm and/or cold weapon among 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

  Male Female Total
Variables % 95 % CI % 95 % CI % 95 % CI 
Sociodemographic characteristics
 Age group
   ≥ 14 years 11.47 (10.91–12.04) 6.20 (5.84–6.58) 8.54 (8.22–8.87)
  15 or over 17.96 (17.12–18.83) 9.80 (9.14–10.57) 14.30 (13.74–14.88)
 Ethnicity/skin color
  White 13.20 (12.45–13.98) 6.39 (5.88–6.94) 9.81 (9.35–10.29)
  Black 16.60 (15.30–17.98) 8.53 (7.47–9.72) 13.01 (12.13–13.94)
  Yellow 14.75 (12.34–17.54) 7.40 (6.00–9.08) 10.62 (9.27–12.15)
  Brown 12.95 (12.25–13.69) 7.12 (6.65–7.63) 9.66 (9.25–10.09)
  Indigenous 16.78 (14.30–19.59) 11.11 (9.01–13.62) 13.83 (12.18–15.67)
 Type of school
  Private 12.01 (11.01–13.08) 5.31 (4.64–6.07) 8.61 (8.00–9.26)
  Public 14.21 (13.68–14.75) 7.56 (7.19–7.95) 10.72 (10.40–11.05)
 Employment
  No 11.94 (11.45–12.45) 6.60 (6.27–6.95) 9.03 (8.74–9.33)
  Yes 22.78 (21.45–24.17) 12.94 (11.63–14.37) 19.18 (18.19–20.20)
Health–risk behaviors
 Cigarette smoking in the previous 30 days
  No 12.12 (11.67–12.59) 6.25 (5.93–6.57) 9.05 (8.78–9.33)
  Yes 45.34 (42.31–48.40) 25.00 (22.47–27.71) 34.83 (32.80–36.93)
 Alcohol intake in the previous 30 days
  No 9.18 (8.73–9.65) 4.92 (4.59–5.26) 6.98 (6.70–7.27)
  Yes 27.51 (26.30–28.77) 13.38 (12.56–14.24) 19.91 (19.18–20.66)
 Use of illicit drugs
  No 12.5 (12.01–12.94) 6.64 (6.32–6.70) 9.41 (9.10–9.69)
  Yes 59.1 (55.13–63.00) 33.70 (29.30–38.41) 48.60 (44.93–51.19)
Mental Health
 Insomnia
  No 13.07 (12.59–13.56) 6.30 (5.97–6.64) 9.65 (9.36–9.95)
  Yes 24.38 (22.10–26.82) 13.24 (12.05–14.53) 16.71 (15.60–17.87)
 Close friends
  One or more 13.29 (12.82–13.78) 7.05 (6.72–7.39) 10.00 (9.71–10.29)
  None 24.03 (21.27–27.03) 11.97 (9.51–14.95) 19.53 (17.53–21.70)
Parental supervision
 Living with father and/or mother
  Yes 13.58 (13.11–14.08) 6.91 (6.58–7.26) 10.13 (9.84–10.43)
  No 18.78 (16.57–21.21) 11.40 (9.88–13.11) 14.43 (13.13–15.83)
 Skipping classes without permission
  No 10.99 (10.51–11.50) 5.46 (5.14–5.80) 8.03 (7.74–8.32)
  Yes 21.09 (20.00–22.21) 12.67 (11.78–13.59) 17.02 (16.31–17.76)
Context of violence
 Suffering family violence
  No 11.82 (11.37–12.29) 5.93 (5.62–6.27) 8.78 (8.50–9.06)
  Yes 32.11 (29.98–34.33) 16.85 (15.45–18.35) 23.47 (22.23–24.77)
 Suffering bullying
  No 13.40 (12.92–13.9) 6.64 (6.32–6.98) 9.84 (9.55–10.14)
  Yes 18.37 (16.59–20.29) 14.68 (12.85–16.72) 16.63 (15.34–18.01)
 Unsafe on the way to and from and/or at school
  No 11.58 (11.13–12.06) 6.22 (5.90–6.56) 8.76 (8.48–9.05)
  Yes 28.84 (27.04–30.69) 14.62 (13.30–16.05) 21.86 (20.71–23.05)
  1. 95 % CI 95 % confidence interval