condition mean min max ZT0-3 2.03371 2.03371 2.03371 ZT4-7 1.197355 1.197355 1.197355 ZT8-11 0.4094675 0.4094675 0.4094675 ZT12-15 0.7664645000000001 0.7664645000000001 0.7664645000000001 ZT16-19 2.3281799999999997 2.3281799999999997 2.3281799999999997 ZT20-23 1.5553599999999999 1.5553599999999999 1.5553599999999999