condition mean min max ZT0-3 21.288600000000002 19.351750000000003 23.225450000000002 ZT4-7 12.479800000000001 12.479800000000001 12.479800000000001 ZT8-11 16.40235 16.40235 16.40235 ZT12-15 0 0 0 ZT16-19 21.2745 21.2745 21.2745 ZT20-23 20.3131 20.3131 20.3131