condition mean min max ZT0-3 3.2742475000000004 2.59036 3.9581350000000004 ZT4-7 0.9023715 0.9023715 0.9023715 ZT8-11 0.4146215 0.4146215 0.4146215 ZT12-15 0 0 0 ZT16-19 2.1784850000000002 2.1784850000000002 2.1784850000000002 ZT20-23 4.450565 4.450565 4.450565