condition mean min max ZT0-3 335.3 335.3 335.3 ZT4-7 251.1 251.1 251.1 ZT8-11 244.05 244.05 244.05 ZT12-15 223.14999999999998 223.14999999999998 223.14999999999998 ZT16-19 304.55 304.55 304.55 ZT20-23 380.4 380.4 380.4