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Table 3 Modified Poisson regression- association between fighting-related injury and individual and area-level family affluence by sex

From: Physical fighting, fighting-related injuries and family affluence among Canadian youth

 

Bivariate model

Multivariate modela,b

 

Male

Female

Male

Female

 

RR (95 % CI)

p-value

RR (95 % CI)

p-value

RR (95 % CI)

p-value

RR (95 % CI)

p-value

Self-perceived affluence

        

Low

1.64 (1.07–2.49)

0.022

4.03 (2.34–6.94)

<0.001

1.07 (0.67–1.73)

0.775

2.94 (1.69–5.11)

<0.001

Moderate

1.51 (1.19–1.92)

0.001

2.14 (1.36–3.36)

0.001

1.32 (0.98–1.77)

0.063

1.74 (1.07–2.83)

0.024

High

1.00 (Ref)

 

1.00 (Ref)

 

1.00 (Ref)

 

1.00 (Ref)

 

Family affluence scale

        

Low

3.47 (2.05–5.87)

<0.001

1.50 (0.56–4.02)

0.424

2.10 (1.23–3.58)

0.006

1.34 (0.54–3.38)

0.528

Moderate

0.88 (0.68–1.15)

0.362

1.24 (0.90–1.70)

0.193

0.83 (0.62–1.13)

0.240

1.14 (0.81–1.60)

0.462

High

1.00 (Ref)

 

1.00 (Ref)

 

1.00 (Ref)

 

1.00 (Ref)

 

Average household income

        

Low

1.08 (0.75–1.55)

0.677

2.00 (1.07–3.73)

0.030

0.82 (0.55–1.22)

0.335

1.51 (0.77–2.97)

0.229

Moderate

1.13 (0.82–1.57)

0.450

1.66 (0.92–2.99)

0.094

1.02 (0.71–1.48)

0.903

1.62 (0.81–3.23

0.172

High

1.00 (Ref)

 

1.00 (Ref)

 

1.00 (Ref)

 

1.00 (Ref)

 

Sub-cohort analysisc

Bivariate model

Multivariate modelb,d

 

RR (95 % CI)

p-value

RR (95 % CI)

p-value

RR (95 % CI)

p-value

RR (95 % CI)

p-value

Self-perceived affluence

        

Low

1.64 (0.91–2.95)

0.102

4.10 (1.77–9.53)

0.001

1.28 (0.66–2.47)

0.469

2.79 (1.12–6.91)

0.027

Moderate

1.32 (0.93–1.87)

0.126

2.25 (1.12–4.51)

0.023

1.33 (0.83–2.13)

0.233

1.76 (0.84–3.68)

0.133

High

1.00 (Ref)

 

1.00 (Ref)

 

1.00 (Ref)

 

1.00 (Ref)

 

Family affluence scale

        

Low

3.68 (1.75–7.74)

<0.001

0.78 (0.20–3.03)

0.719

1.74 (0.85–3.57)

0.129

0.80 (0.22–2.93)

0.734

Moderate

0.67 (0.45–1.01)

0.057

1.31 (0.81–2.11)

0.271

0.55 (0.32–0.94)

0.030

1.13 (0.68–1.87)

0.634

High

1.00 (Ref)

 

1.00 (Ref)

 

1.00 (Ref)

 

1.00 (Ref)

 

Average household income

        

Low

1.16 (0.68–1.98)

0.581

1.33 (0.67–2.65)

0.413

1.20 (0.72–1.99)

0.489

1.12 (0.51–2.44)

0.778

Moderate

1.42 (0.90–2.24)

0.133

1.38 (0.68–2.81)

0.377

1.61 (0.97–2.69)

0.068

1.52 (0.67–3.49)

0.319

High

1.00 (Ref)

 

1.00 (Ref)

 

1.00 (Ref)

 

1.00 (Ref)

 
  1. aMultivariate regression analysis adjusted for sex, age, respectful students, alcohol use, happy home life, and sport team. P(interaction) = 0.027 for self-perceived affluence, P = 0.290 for family affluence scale, and P = 0.172 for area-level income. bAll multivariate model adjusted using backwards elimination with a criteria of p < 0.15. cA sub-cohort of 10,429 grade 9–10 students was analyzed to account for confounders only available in the grade 9 and 10 version of the HBSC survey. dMultivariate regression analysis for Grade 9 and 10 HBSC survey only and adjusted for sex, age, academic performance, respectful students, alcohol use, marijuana use, and happy home life. P(interaction) = 0.385 for self-perceived affluence, P = 0.085 for FAS, and P = 0.989
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BMC Public Health

ISSN: 1471-2458

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