condition mean min max ZT0-3 108.924365 108.924365 108.924365 ZT4-7 175.341006 175.341006 175.341006 ZT8-11 65.13429550000001 65.13429550000001 65.13429550000001 ZT12-15 58.120627999999996 58.120627999999996 58.120627999999996 ZT16-19 23.949213 23.949213 23.949213 ZT20-23 30.6504295 30.6504295 30.6504295