condition mean min max ZT0-3 4.9350275 3.613375 6.25668 ZT4-7 34.25145 34.25145 34.25145 ZT8-11 36.02115 36.02115 36.02115 ZT12-15 0 0 0 ZT16-19 5.101725 5.101725 5.101725 ZT20-23 5.150745000000001 5.150745000000001 5.150745000000001