condition mean min max ZT0-3 2267.4066666666668 2049.3450000000003 2699.685 ZT4-7 2314.31 2314.31 2314.31 ZT8-11 2325.16 2325.16 2325.16 ZT12-15 2160.9649999999997 2051.5299999999997 2270.3999999999996 ZT16-19 1965.21 1965.21 1965.21 ZT20-23 1623.81 1623.81 1623.81