At the indicator level, the amount of data (sample size) needed to obtain an indicator score is considered on a case-by-case basis by data providers and the experts in the TWG. If the sample size is considered inadequate the indicator will not be scored.
To aggregate indicators into category and index scores, decision rules were developed for the minimum proportion of information required:
- ≥ 50% of measured indicators to generate the indicator category score (where relevant)
- ≥ 60% of indicator categories to generate an index score *
Overall scores for reporting zones are presented in the report card, even if not all indices are available.
*Due to the interim approach for reporting the seagrass index, which incorporates two separate programs (each reporting three of their own specific indicators), there needed to be a separate decision rule for generating seagrass index scores. For more information please refer to the technical reports.