condition mean min max ZT0-3 1.7978532500000002 0.9072715 2.688435 ZT4-7 0.495718 0.495718 0.495718 ZT8-11 0.498244 0.498244 0.498244 ZT12-15 0 0 0 ZT16-19 1.0663885 1.0663885 1.0663885 ZT20-23 1.1138569999999999 1.1138569999999999 1.1138569999999999