condition mean min max ZT0-3 307.572513 307.572513 307.572513 ZT4-7 206.3263685 206.3263685 206.3263685 ZT8-11 200.936447 200.936447 200.936447 ZT12-15 249.82630849999998 249.82630849999998 249.82630849999998 ZT16-19 378.21661800000004 378.21661800000004 378.21661800000004 ZT20-23 433.625104 433.625104 433.625104