condition mean min max ZT0-3 24.182375 21.6193 26.745449999999998 ZT4-7 13.77545 13.77545 13.77545 ZT8-11 12.08235 12.08235 12.08235 ZT12-15 0 0 0 ZT16-19 16.59115 16.59115 16.59115 ZT20-23 20.62255 20.62255 20.62255