condition mean min max ZT0-3 4.97589 4.97589 4.97589 ZT4-7 3.13706 3.13706 3.13706 ZT8-11 1.9887899999999998 1.9887899999999998 1.9887899999999998 ZT12-15 3.5147899999999996 3.5147899999999996 3.5147899999999996 ZT16-19 3.1252 3.1252 3.1252 ZT20-23 6.358785 6.358785 6.358785