condition mean min max ZT0-3 4.5861446814999995 3.6573203249999997 5.514969037999999 ZT4-7 1.34571152475 1.3261318885 1.365291161 ZT8-11 2.78459747475 2.1536947715 3.4155001780000003 ZT12-15 5.1001669505 3.8600908465000003 6.3402430545 ZT16-19 5.037409919750001 4.825720176000001 5.249099663500001 ZT20-23 6.2996550760000005 6.0396671505 6.5596430015000005