condition mean min max ZT0-3 10.586879 10.586879 10.586879 ZT4-7 17.3527085 17.3527085 17.3527085 ZT8-11 13.572039 13.572039 13.572039 ZT12-15 13.228363 13.228363 13.228363 ZT16-19 12.9584415 12.9584415 12.9584415 ZT20-23 11.537719 11.537719 11.537719