condition mean min max ZT0-3 38.714022 38.714022 38.714022 ZT4-7 34.3550305 34.3550305 34.3550305 ZT8-11 38.449487000000005 38.449487000000005 38.449487000000005 ZT12-15 50.3496565 50.3496565 50.3496565 ZT16-19 54.574427 54.574427 54.574427 ZT20-23 54.840439 54.840439 54.840439