condition mean min max ZT0-3 11.074471 11.074471 11.074471 ZT4-7 11.4935875 11.4935875 11.4935875 ZT8-11 12.4716155 12.4716155 12.4716155 ZT12-15 13.357418500000001 13.357418500000001 13.357418500000001 ZT16-19 12.512191999999999 12.512191999999999 12.512191999999999 ZT20-23 10.0098545 10.0098545 10.0098545