condition mean min max ZT0-3 5.7617475 5.296265 6.2272300000000005 ZT4-7 3.202235 3.202235 3.202235 ZT8-11 3.0064200000000003 3.0064200000000003 3.0064200000000003 ZT12-15 0 0 0 ZT16-19 4.826505 4.826505 4.826505 ZT20-23 7.465365 7.465365 7.465365