The statistics uses data collected until 1st of december 2019. It shows an aggregation of TYPO3 patch level versions for TYPO3 webseites with a known major version. The statistics does only contain TYPO3 sites, where the patch level version could be resolved (63,84% of all sites in the database).
For websites, where it is clearly possible to analyze the TYPO3 patch level version, only 49.211 (23.91%) out of 205.789 websites use a secure TYPO3 version.For 31.962 websites (primary old 4.x websites), the latest secure patch level version could not be resolved clearly.