condition mean min max ZT0-3 17.8112 17.42145 18.20095 ZT4-7 13.775 13.775 13.775 ZT8-11 9.589839999999999 9.589839999999999 9.589839999999999 ZT12-15 0 0 0 ZT16-19 16.3019 16.3019 16.3019 ZT20-23 14.66965 14.66965 14.66965