condition mean min max ZT0-3 8.259227500000001 7.477265000000001 9.04119 ZT4-7 4.350545 4.350545 4.350545 ZT8-11 3.370665 3.370665 3.370665 ZT12-15 0 0 0 ZT16-19 3.25368 3.25368 3.25368 ZT20-23 5.199574999999999 5.199574999999999 5.199574999999999