condition mean min max ZT0-3 3.8202974999999997 2.41344 5.227155 ZT4-7 1.45944 1.45944 1.45944 ZT8-11 2.4360999999999997 2.4360999999999997 2.4360999999999997 ZT12-15 0 0 0 ZT16-19 9.616165 9.616165 9.616165 ZT20-23 3.5150249999999996 3.5150249999999996 3.5150249999999996