condition mean min max ZT0-3 13.67819 13.67819 13.67819 ZT4-7 14.3639935 14.3639935 14.3639935 ZT8-11 14.687299 14.687299 14.687299 ZT12-15 15.0542215 15.0542215 15.0542215 ZT16-19 11.803144 11.803144 11.803144 ZT20-23 16.202344 16.202344 16.202344