condition mean min max ZT0-3 3502.331199 3502.331199 3502.331199 ZT4-7 3163.844059 3163.844059 3163.844059 ZT8-11 2803.026847 2803.026847 2803.026847 ZT12-15 3057.821016 3057.821016 3057.821016 ZT16-19 3031.6501085 3031.6501085 3031.6501085 ZT20-23 2183.9383585 2183.9383585 2183.9383585