condition mean min max ZT0-3 14.284127 14.284127 14.284127 ZT4-7 10.559672500000001 10.559672500000001 10.559672500000001 ZT8-11 11.073174999999999 11.073174999999999 11.073174999999999 ZT12-15 19.211059 19.211059 19.211059 ZT16-19 12.467681500000001 12.467681500000001 12.467681500000001 ZT20-23 33.531137 33.531137 33.531137