condition mean min max ZT0-3 24.268749999999997 21.77775 26.759749999999997 ZT4-7 7.923805 7.923805 7.923805 ZT8-11 4.84063 4.84063 4.84063 ZT12-15 0 0 0 ZT16-19 8.225125 8.225125 8.225125 ZT20-23 16.679949999999998 16.679949999999998 16.679949999999998