condition mean min max ZT0-3 28.123033333333336 25.5805 29.6717 ZT4-7 15.175899999999999 15.175899999999999 15.175899999999999 ZT8-11 6.62033 6.62033 6.62033 ZT12-15 12.900475 11.6176 14.18335 ZT16-19 18.40345 18.40345 18.40345 ZT20-23 21.18055 21.18055 21.18055