condition mean min max ZT0-3 17.47015 15.92425 19.01605 ZT4-7 7.677315 7.677315 7.677315 ZT8-11 1.858345 1.858345 1.858345 ZT12-15 0 0 0 ZT16-19 1.2140499999999999 1.2140499999999999 1.2140499999999999 ZT20-23 8.925615 8.925615 8.925615