condition mean min max ZT0-3 29.67705 27.2438 33.98295 ZT4-7 32.69925 32.69925 32.69925 ZT8-11 39.34365 39.34365 39.34365 ZT12-15 41.611025 40.16145 43.0606 ZT16-19 35.5519 35.5519 35.5519 ZT20-23 25.8315 25.8315 25.8315