condition mean min max ZT0-3 10.001832499999999 8.118115 11.88555 ZT4-7 6.5086949999999995 6.5086949999999995 6.5086949999999995 ZT8-11 4.57726 4.57726 4.57726 ZT12-15 0 0 0 ZT16-19 21.66035 21.66035 21.66035 ZT20-23 14.4 14.4 14.4