condition mean min max ZT0-3 3.5863625 3.490055 3.68267 ZT4-7 3.694815 3.694815 3.694815 ZT8-11 3.2443299999999997 3.2443299999999997 3.2443299999999997 ZT12-15 0 0 0 ZT16-19 4.37654 4.37654 4.37654 ZT20-23 4.083615 4.083615 4.083615