condition mean min max ZT0-3 56.2151095725 44.83759558 67.592623565 ZT4-7 46.2460953825 42.795418545000004 49.69677222 ZT8-11 17.398510627 12.210476531000001 22.586544723000003 ZT12-15 8.06369406775 5.8757710085 10.251617127 ZT16-19 18.039614105 13.94108944 22.138138769999998 ZT20-23 35.0317304125 31.658613430000003 38.404847395000004