condition mean min max ZT0-3 13.240874999999999 11.538450000000001 14.943299999999999 ZT4-7 13.302 13.302 13.302 ZT8-11 13.7725 13.7725 13.7725 ZT12-15 0 0 0 ZT16-19 21.59655 21.59655 21.59655 ZT20-23 18.2839 18.2839 18.2839