condition mean min max ZT0-3 13.629877 13.629877 13.629877 ZT4-7 13.453382999999999 13.453382999999999 13.453382999999999 ZT8-11 11.8449705 11.8449705 11.8449705 ZT12-15 13.8201015 13.8201015 13.8201015 ZT16-19 11.1333205 11.1333205 11.1333205 ZT20-23 9.826838500000001 9.826838500000001 9.826838500000001