condition mean min max ZT0-3 204.282626 204.282626 204.282626 ZT4-7 145.8470995 145.8470995 145.8470995 ZT8-11 168.6612245 168.6612245 168.6612245 ZT12-15 165.902488 165.902488 165.902488 ZT16-19 215.5338015 215.5338015 215.5338015 ZT20-23 195.87189999999998 195.87189999999998 195.87189999999998