condition mean min max ZT0-3 506.331293 506.331293 506.331293 ZT4-7 620.667809 620.667809 620.667809 ZT8-11 667.636242 667.636242 667.636242 ZT12-15 699.9194295 699.9194295 699.9194295 ZT16-19 673.192942 673.192942 673.192942 ZT20-23 612.3806645 612.3806645 612.3806645