condition mean min max ZT0-3 16.00549 16.00549 16.00549 ZT4-7 14.815686499999998 14.815686499999998 14.815686499999998 ZT8-11 13.393207499999999 13.393207499999999 13.393207499999999 ZT12-15 18.5630115 18.5630115 18.5630115 ZT16-19 17.3263155 17.3263155 17.3263155 ZT20-23 22.3230885 22.3230885 22.3230885