condition mean min max ZT0-3 1.4218739999999999 0.661923 2.181825 ZT4-7 6.607045 6.607045 6.607045 ZT8-11 15.54505 15.54505 15.54505 ZT12-15 0 0 0 ZT16-19 0.8831775000000001 0.8831775000000001 0.8831775000000001 ZT20-23 1.59704 1.59704 1.59704