The revised inspection arrangements were introduced in 2009 as part of a "proportionate" approach that would see high-performing schools inspected less often.
Earlier this month, the regulator published results from inspections during the autumn term last year when the changes took effect.
Since September 2010, Ofsted has not inspected schools judged "outstanding" unless there was a specific reason to do so.
The regulator continued to inspect "good" schools but only looked at a small number, mostly where data showed performance has slipped.
The schools inspected during autumn 2010 therefore comprise mostly of those previously judged "satisfactory" or "inadequate", or good schools where performance seemed to be at risk.
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