condition mean min max ZT0-3 58.596525 56.98095 60.2121 ZT4-7 25.70725 25.70725 25.70725 ZT8-11 32.6528 32.6528 32.6528 ZT12-15 0 0 0 ZT16-19 80.0346 80.0346 80.0346 ZT20-23 55.008799999999994 55.008799999999994 55.008799999999994