condition mean min max ZT0-3 25.76195 21.28915 30.23475 ZT4-7 13.838000000000001 13.838000000000001 13.838000000000001 ZT8-11 9.265355 9.265355 9.265355 ZT12-15 0 0 0 ZT16-19 18.83125 18.83125 18.83125 ZT20-23 23.72635 23.72635 23.72635