condition mean min max ZT0-3 65.703749 65.703749 65.703749 ZT4-7 55.4455215 55.4455215 55.4455215 ZT8-11 84.750387 84.750387 84.750387 ZT12-15 62.2170715 62.2170715 62.2170715 ZT16-19 65.686631 65.686631 65.686631 ZT20-23 82.999015 82.999015 82.999015