condition mean min max ZT0-3 13.0205 11.47965 14.561350000000001 ZT4-7 7.672219999999999 7.672219999999999 7.672219999999999 ZT8-11 6.355124999999999 6.355124999999999 6.355124999999999 ZT12-15 0 0 0 ZT16-19 8.719075 8.719075 8.719075 ZT20-23 10.9256 10.9256 10.9256