condition mean min max ZT0-3 1.16843732575 0.785413547 1.5514611045 ZT4-7 3.743931539 3.4283635820000002 4.059499496 ZT8-11 1.9074399097499999 1.7638573575 2.0510224619999997 ZT12-15 2.3513192697500003 1.5159264225000002 3.186712117 ZT16-19 3.93591325 3.7183891735000003 4.1534373265 ZT20-23 4.7699819222499995 4.5746081069999995 4.9653557374999995