condition mean min max ZT0-3 34.412051250000005 33.20335771 35.62074479 ZT4-7 27.8192814025 27.53289052 28.105672285 ZT8-11 29.9333018675 27.164031885 32.70257185 ZT12-15 18.7211244125 14.36336541 23.078883415 ZT16-19 17.604177397500003 16.21485733 18.993497465 ZT20-23 15.472994352499999 14.14574098 16.800247725