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Table 2 Distribution of students by gender, age and selected socio-demographic characteristics

From: Knowledge of human papillomavirus infection and its prevention among adolescents and parents in the greater Milan area, Northern Italy

  Females
(n = 649)
  Males
(n = 209)
  All
(n = 863)a
 
  No. % No. % No. %
Age (years)       
14-15 231 35.6 85 40.7 317 36.7
16-17 309 47.6 92 44.0 402 46.6
≥18 107 16.5 30 14.3 137 15.9
Missing values 2 0.3 2 1.0 7 0.8
Mean age ± SD (years) 16.2 ± 1.44   16.0 ± 1.59   16.1 ± 1.48  
Education (mother)       
Middle school diploma 133 20.5 28 13.4 161 18.7
High school diploma 312 48.1 93 44.5 408 47.3
Degree 191 29.4 85 40.7 278 32.1
Missing values 13 2.0 3 1.4 16 1.9
Education (father)       
Middle school diploma 148 22.8 32 15.3 180 20.9
High school diploma 242 37.3 62 29.7 308 35.7
Degree 239 36.8 108 51.7 348 40.3
Missing values 20 3.1 7 3.3 27 3.1
No. of siblings       
0 150 23.1 41 19.6 194 22.5
1 359 55.3 115 55.0 476 55.2
2 104 16.1 38 18.2 142 16.4
≥3 36 5.5 15 7.2 51 5.9
  1. SD, standard deviation. a Five students did not answer the question concerning gender.