condition mean min max ZT0-3 6.0598600000000005 6.0598600000000005 6.0598600000000005 ZT4-7 4.143445 4.143445 4.143445 ZT8-11 4.54994 4.54994 4.54994 ZT12-15 6.011015 6.011015 6.011015 ZT16-19 10.05088 10.05088 10.05088 ZT20-23 9.240275 9.240275 9.240275