condition mean min max ZT0-3 33.428621 33.428621 33.428621 ZT4-7 29.3417025 29.3417025 29.3417025 ZT8-11 31.6897295 31.6897295 31.6897295 ZT12-15 35.2368875 35.2368875 35.2368875 ZT16-19 74.1986805 74.1986805 74.1986805 ZT20-23 61.0702155 61.0702155 61.0702155