condition mean min max ZT0-3 2.80579619325 1.587362116 4.0242302705 ZT4-7 2.13348406425 1.173200442 3.0937676865 ZT8-11 3.3070630210000003 0.4753327585 6.1387932835 ZT12-15 19.80120044275 12.2221314205 27.380269465 ZT16-19 16.4347116375 16.174120135 16.69530314 ZT20-23 17.953558155000003 17.340816575 18.566299735