condition mean min max ZT0-3 17.0945 17.0945 17.0945 ZT4-7 10.2166 10.2166 10.2166 ZT8-11 9.72223 9.72223 9.72223 ZT12-15 11.96045 11.96045 11.96045 ZT16-19 23.36055 23.36055 23.36055 ZT20-23 19.1415 19.1415 19.1415