condition mean min max ZT0-3 17.026342403 14.299012476000001 19.75367233 ZT4-7 5.36733243775 4.953273735 5.7813911405 ZT8-11 4.9719406495000005 4.7689963385 5.1748849605 ZT12-15 4.92921132725 4.9057201985 4.952702456000001 ZT16-19 8.580879648749999 6.7859550025 10.375804295 ZT20-23 15.65328873 15.317047265 15.989530195