condition mean min max ZT0-3 5.4031125 4.67915 6.127075 ZT4-7 3.185275 3.185275 3.185275 ZT8-11 2.79365 2.79365 2.79365 ZT12-15 0 0 0 ZT16-19 6.2637599999999996 6.2637599999999996 6.2637599999999996 ZT20-23 5.5456900000000005 5.5456900000000005 5.5456900000000005