condition mean min max ZT0-3 1.7395162245 1.462404871 2.016627578 ZT4-7 2.22130651325 1.6523585655 2.790254461 ZT8-11 3.0958333207499997 2.8414685445 3.350198097 ZT12-15 2.20795048 1.9317161610000002 2.4841847990000003 ZT16-19 0.57181138525 0.4956739025 0.6479488680000001 ZT20-23 0.31772438775 0.23362039499999998 0.4018283805