> [!CAUTION]
> **Caution:** This documentation is for Google Ads API **v23** . The latest active version is [**v26**](https://developers.google.com/google-ads/api/reference/rpc/latest/AudienceCompositionMetrics).

The share and index metrics associated with an attribute in an audience composition insights report.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v23/services/audience_insights_service.proto)

| Fields ||
|---|---|
| ## `audience_share` | `double` The fraction (from 0 to 1 inclusive) of the specific audience that match the attribute. |
| ## `baseline_audience_share` | `double` The fraction (from 0 to 1 inclusive) of the baseline audience that match the attribute. |
| ## `index` | `double` The ratio of audience_share to baseline_audience_share, or zero if this ratio is undefined or is not meaningful. |
| ## `score` | `double` A relevance score from 0 to 1 inclusive. Note: When an `InsightsAudience.user_list` is requested or when the request contains the USER_LIST dimension, score is omitted. |