| 
      ( Needle= intravenous induction of anesthesia; mask= inhaled induction of anesthesia)
        | Numbers (N) of children |  | Age (years) |  
        |  |  | <2 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |  
        | N selecting needle | 23     (20%) | 0 | 0 | 0 | 0 | 3 | 2 | 3 | 0 | 1 | 1 | 2 | 2 | 1 | 3 | 3 | 2 |  
        | N actually induced by    needle | 13     (56%) | 0 | 0 | 0 | 0 | 2 | 1 | 2 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 2 | 1 |  
        | N eventually induced by    mask | 10     (44%) | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 |  |