Appendix 1: School sample

ERO generated a random sample of all state or state‑integrated, English‑medium schools in New Zealand. The sample was representative of New Zealand schools for type, decile and location.[23]

Table 1: School type

School type Number of schools in sample Percentage of schools in sample National percentage of schools[24] 
Contributing (Year 1-6) 80 36 34
Full Primary (Year 1-8) 93 42 43
Intermediate (Year 7 and 8) 10 4 5
Composite (Year 1-15) 8 4 3
Restricted Composite (Year 7-10) 1 1 1
Secondary (Year 7-15) 13 6 4
Secondary (Year 9-15) 16 7 10
Total 221 100 100

Table 2: School decile

Decile group Number of schools in sample Percentage of schools in sample National percentage of schools
Low (Decile 1‑3) 74 33 28
Medium (Decile 4‑7) 81 37 40
High (Decile 8‑10) 66 30 32
Total 221 100 100

Table 3: School location[25]

Location Number of schools in sample Percentage of schools in sample National percentage of schools
Main urban 111 50 54
Secondary urban 15 7 6
Minor urban[26] 26 12 12
Rural 69 31 28
Total 221 100 100



[23] The differences between observed and expected values in Tables 1-3 were tested using a Chi square test. The level of statistical significance was p<0.05

[24]The national percentage of schools is as at September 2017.

[25] Main urban areas have a population greater than 30,000

Secondary urban areas have a population between 10,000 and 29,999

Minor urban areas have a population between 1000 and 9,999

Rural areas have a population less than 1000

[26] These cells have expected frequencies smaller than five. This means that the results are less reliable.