condition mean min max ZT0-3 395.987967 395.987967 395.987967 ZT4-7 515.8393545 515.8393545 515.8393545 ZT8-11 411.854109 411.854109 411.854109 ZT12-15 495.447294 495.447294 495.447294 ZT16-19 460.7835705 460.7835705 460.7835705 ZT20-23 429.41108 429.41108 429.41108