condition mean min max ZT0-3 6.1925025 3.5857849999999996 8.79922 ZT4-7 32.97085 32.97085 32.97085 ZT8-11 13.030650000000001 13.030650000000001 13.030650000000001 ZT12-15 0 0 0 ZT16-19 7.041725 7.041725 7.041725 ZT20-23 7.708385 7.708385 7.708385