condition mean min max ZT0-3 8.301997 8.301997 8.301997 ZT4-7 12.1488965 12.1488965 12.1488965 ZT8-11 11.508015 11.508015 11.508015 ZT12-15 11.016657 11.016657 11.016657 ZT16-19 11.734795 11.734795 11.734795 ZT20-23 10.376528 10.376528 10.376528