condition mean min max ZT0-3 39.674675 32.83985 46.5095 ZT4-7 25.692999999999998 25.692999999999998 25.692999999999998 ZT8-11 25.37475 25.37475 25.37475 ZT12-15 0 0 0 ZT16-19 36.80785 36.80785 36.80785 ZT20-23 41.262649999999994 41.262649999999994 41.262649999999994