condition mean min max ZT0-3 13.546949999999999 13.403849999999998 13.69005 ZT4-7 11.9533 11.9533 11.9533 ZT8-11 14.693249999999999 14.693249999999999 14.693249999999999 ZT12-15 0 0 0 ZT16-19 17.27095 17.27095 17.27095 ZT20-23 16.6622 16.6622 16.6622