condition mean min max ZT0-3 3.0958875 2.736205 3.45557 ZT4-7 4.18711 4.18711 4.18711 ZT8-11 4.9279150000000005 4.9279150000000005 4.9279150000000005 ZT12-15 0 0 0 ZT16-19 2.3156 2.3156 2.3156 ZT20-23 4.811405000000001 4.811405000000001 4.811405000000001