condition mean min max ZT0-3 211.546759 211.546759 211.546759 ZT4-7 288.778344 288.778344 288.778344 ZT8-11 290.1329835 290.1329835 290.1329835 ZT12-15 262.257609 262.257609 262.257609 ZT16-19 193.52443549999998 193.52443549999998 193.52443549999998 ZT20-23 174.803855 174.803855 174.803855