condition mean min max ZT0-3 501.816126 501.816126 501.816126 ZT4-7 523.6924805 523.6924805 523.6924805 ZT8-11 459.57299850000004 459.57299850000004 459.57299850000004 ZT12-15 374.403069 374.403069 374.403069 ZT16-19 400.93476999999996 400.93476999999996 400.93476999999996 ZT20-23 359.498397 359.498397 359.498397