condition mean min max ZT0-3 3.2028225 2.83122 3.574425 ZT4-7 2.354865 2.354865 2.354865 ZT8-11 1.302805 1.302805 1.302805 ZT12-15 0 0 0 ZT16-19 3.17625 3.17625 3.17625 ZT20-23 3.9748099999999997 3.9748099999999997 3.9748099999999997