
Figure 1:

Figure:

Figure 3:

(below): Table of head knocks January – August 2018 obtained, with permission, from a large private NSLHD boys’ school_
| 21st January | YR 7 | Head Injury |
| 27th Febrnary | YR 10 | Head knock |
| 27th March | YR 8 | Head knock |
| 27th March | YR 8 | Head knock |
| 27th March | YR 8 | Head knock |
| 3rd April | YR 8 | Head injury |
| 4th April | YR 10 | Head knock |
| 6th April | YR 10 | Concussion |
| 7th April | YR 8 | Head knock |
| 7th April | YR 11 | Head knock |
| 7th April | YR 9 | Head knock |
| 7th April | YR 11 | Head knock |
| 9th April | YR 8 | Head Injury |
| 11th April | YR 10 | Concussion - Hospital |
| 7th May | YR 10 | Head injury |
| 7th May | YR12 | Head injury |
| 7th May | YR 10 | Head injury |
| 7th May | YR 12 | Head injury |
| 7th May | YR 8 | Head Injury |
| 9th May | YR 9 | Head Injury |
| 13th May | YR 7 | Head knock |
| 13th May | YR10 | Head knock |
| 13th May | YR 10 | Head knock |
| 13th May | YR 10 | Head knock |
| 13th May | YR 10 | Head knock |
| 15th May | YR 8 | Head knock |
| 16th May | YR 8 | Concussion - Hospital |
| 20th May | YR11 | Head Injury |
| 20th May | YR 8 | Head Injury |
| 20th May | YR 8 | Head injury |
| 21st May | YR 8 | Head Injury |
| 21st May | YR 8 | Head injury |
| 21st May | YR 8 | Head injury |
| 21st May | YR 8 | Head injury |
| 21st May | YR 10 | Head injury |
| 21st May | YR 12 | Head injury |
| 21st May | YR 8 | Concussion - Hospital |
| 21st May | YR 7 | Head injury |
| 21st May | YR 8 | Head injury |
| 22nd May | YR 11 | Head injury |
| 23rd May | YR 7 | Head injury - Hospital |
| 29th May | YR 7 | Head injury |
| 29th May | YR 10 | Head knock |
| 29th May | YR 7 | Head knock |
| 29th May | YR 10 | Head knock |
| 29th May | YR 10 | Concussion - Hospital |
| 5th June | YR 7 | Head injury |
| 5th June | YR 9 | Head injury |
| 5th June | YR 8 | Head injury |
| 5th June | YR 12 | Head knock |
| 17th June | YR 8 | Concussion - Hospital |
| 17th June | YR 9 | Concussion - Hospital |
| 17th June | YR 8 | Concussion - Hospital |
| 17th June | YR 7 | Concussion - Hospital |
| 17th June | YR 12 | Concussion - Hospital |
| 20th June | YR 8 | Head injury |
| 22nd June | YR 7 | Head injury |
| 25th June | YR 7 | Head injury |
| 28th June | YR 10 | Head injury |
| 28th June | YR 8 | Head injury |
| 28th June | YR 10 | Head injury |
| 28th June | YR 12 | Head injury |
| 28th June | YR 7 | Head injury |
| 30th June | YR 10 | Head knock |
| 4th August | YR 8 | Head injury |
| 4th August | YR 7 | Head injury |
| 4th August | YR 10 | Head knock |
| 6th August | YR 12 | Concussion - Hospital |
| 6th August | YR 10 | Head injury |
| 6th August | YR 8 | Head knock |
| 7th August | YR 8 | Head injury |
| 7th August | YR 8 | Head injury |
| 18th August | YR 10 | Head knock |
| 18th August | YR 11 | Head knock |
| 18th August | YR 12 | Head knock - Hospital |
| 18th August | YR 8 | Head knock |
| 18th August | YR 10 | Head knock |
| 18th August | YR 9 | Head knock |
| 18th August | YR 7 | Head knock |
| 18th August | YR 8 | Head knock |
| 18th August | YR 7 | Head knock |
| 18th August | YR 7 | Head knock |
| 18th August | YR 9 | Head knock |
| 20th August | YR 12 | Head injury |
| 20th August | YR 12 | Head injury |
| 20th August | YR 8 | Head injury |
| 20th August | YR 12 | Head injury |
| 20th August | YR 12 | Head injury |
| 20th August | YR 12 | Head injury |
| 20th August | YR 12 | Head injury |
| 21st August | YR 8 | Head injury |