condition mean min max ZT0-3 10.141265 10.141265 10.141265 ZT4-7 14.249159 14.249159 14.249159 ZT8-11 12.923835 12.923835 12.923835 ZT12-15 14.639161 14.639161 14.639161 ZT16-19 20.139290000000003 20.139290000000003 20.139290000000003 ZT20-23 26.254421999999998 26.254421999999998 26.254421999999998