condition mean min max ZT0-3 32.7794 32.7794 32.7794 ZT4-7 20.5433 20.5433 20.5433 ZT8-11 19.665399999999998 19.665399999999998 19.665399999999998 ZT12-15 31.12705 31.12705 31.12705 ZT16-19 14.5736 14.5736 14.5736 ZT20-23 23.4292 23.4292 23.4292