condition mean min max ZT0-3 21.294716666666666 17.2969 24.759149999999998 ZT4-7 12.548549999999999 12.548549999999999 12.548549999999999 ZT8-11 13.4891 13.4891 13.4891 ZT12-15 19.69495 19.1007 20.2892 ZT16-19 21.717100000000002 21.717100000000002 21.717100000000002 ZT20-23 23.904400000000003 23.904400000000003 23.904400000000003