condition mean min max ZT0-3 3.01188 2.79793 3.22583 ZT4-7 3.690495 3.690495 3.690495 ZT8-11 2.80216 2.80216 2.80216 ZT12-15 0 0 0 ZT16-19 9.01432 9.01432 9.01432 ZT20-23 10.408000000000001 10.408000000000001 10.408000000000001