condition mean min max ZT0-3 26.0396 22.2315 29.8477 ZT4-7 14.3538 14.3538 14.3538 ZT8-11 11.399149999999999 11.399149999999999 11.399149999999999 ZT12-15 0 0 0 ZT16-19 19.71295 19.71295 19.71295 ZT20-23 21.2003 21.2003 21.2003