condition mean min max ZT0-3 3.90211 3.90211 3.90211 ZT4-7 2.5241249999999997 2.5241249999999997 2.5241249999999997 ZT8-11 2.8009649999999997 2.8009649999999997 2.8009649999999997 ZT12-15 4.38708 4.38708 4.38708 ZT16-19 10.26916 10.26916 10.26916 ZT20-23 4.418665 4.418665 4.418665