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.
Table 1: School type
|School type||Number of schools in sample||Percentage of schools in sample||National percentage of schools|
|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|
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|
Table 3: School location
|Location||Number of schools in sample||Percentage of schools in sample||National percentage of schools|
 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
The national percentage of schools is as at September 2017.
 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
 These cells have expected frequencies smaller than five. This means that the results are less reliable.