condition mean min max ZT0-3 7.8276075 7.18031 8.474905 ZT4-7 7.833685000000001 7.833685000000001 7.833685000000001 ZT8-11 5.748065 5.748065 5.748065 ZT12-15 0 0 0 ZT16-19 7.583855 7.583855 7.583855 ZT20-23 9.46017 9.46017 9.46017