condition mean min max ZT0-3 1682.6 1682.6 1682.6 ZT4-7 2679.3 2679.3 2679.3 ZT8-11 2725.55 2725.55 2725.55 ZT12-15 2823.85 2823.85 2823.85 ZT16-19 2440.6499999999996 2440.6499999999996 2440.6499999999996 ZT20-23 1827.4 1827.4 1827.4