condition mean min max ZT0-3 13.81955 13.81955 13.81955 ZT4-7 11.0712 11.0712 11.0712 ZT8-11 9.064490000000001 9.064490000000001 9.064490000000001 ZT12-15 11.98705 11.98705 11.98705 ZT16-19 13.29935 13.29935 13.29935 ZT20-23 17.968249999999998 17.968249999999998 17.968249999999998