condition mean min max ZT0-3 13.735900433333333 6.515751300000001 20.37465 ZT4-7 17.548499999999997 17.548499999999997 17.548499999999997 ZT8-11 16.43705 16.43705 16.43705 ZT12-15 29.488675 28.89345 30.0839 ZT16-19 14.1994 14.1994 14.1994 ZT20-23 13.962789999999998 13.962789999999998 13.962789999999998