condition mean min max ZT0-3 11.7645 11.6982 11.8308 ZT4-7 7.71729 7.71729 7.71729 ZT8-11 6.035425 6.035425 6.035425 ZT12-15 0 0 0 ZT16-19 9.22245 9.22245 9.22245 ZT20-23 12.21735 12.21735 12.21735