condition mean min max ZT0-3 243.062047 243.062047 243.062047 ZT4-7 142.39031799999998 142.39031799999998 142.39031799999998 ZT8-11 187.434113 187.434113 187.434113 ZT12-15 220.0250735 220.0250735 220.0250735 ZT16-19 257.4812015 257.4812015 257.4812015 ZT20-23 234.48839099999998 234.48839099999998 234.48839099999998