condition mean min max ZT0-3 6087.95 6087.95 6087.95 ZT4-7 18332.9 18332.9 18332.9 ZT8-11 19547.3 19547.3 19547.3 ZT12-15 12818.6 12818.6 12818.6 ZT16-19 13717.5 13717.5 13717.5 ZT20-23 11766.650000000001 11766.650000000001 11766.650000000001