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Division 6 For those guidelines which allow for the study to be designed to determine an effective concentration (ECx), the study shall be conducted to determine an EC10, EC20 and EC50, when required, along with corresponding 95 % confidence intervals. If an ECx approach is used, a no observed effect concentration (NOEC) shall still be determined.

United Kingdom

Original text. Later amendments are not shown.

Existing acceptable studies that have been designed to generate a NOEC shall not be repeated. An assessment of the statistical power of the NOEC derived from those studies shall be carried out.