condition mean min max ZT0-3 4.2303625 4.121245 4.33948 ZT4-7 3.7051499999999997 3.7051499999999997 3.7051499999999997 ZT8-11 5.329035 5.329035 5.329035 ZT12-15 0 0 0 ZT16-19 7.4331 7.4331 7.4331 ZT20-23 5.581645 5.581645 5.581645