condition mean min max ZT0-3 4.413237499999999 4.143935 4.6825399999999995 ZT4-7 6.3812999999999995 6.3812999999999995 6.3812999999999995 ZT8-11 6.01964 6.01964 6.01964 ZT12-15 0 0 0 ZT16-19 7.61139 7.61139 7.61139 ZT20-23 9.672205 9.672205 9.672205