condition mean min max ZT0-3 22.234949999999998 20.2214 24.2485 ZT4-7 19.2892 19.2892 19.2892 ZT8-11 13.39725 13.39725 13.39725 ZT12-15 0 0 0 ZT16-19 13.73295 13.73295 13.73295 ZT20-23 17.97685 17.97685 17.97685