condition mean min max ZT0-3 1.1958777445000002 1.052882302 1.3388731870000001 ZT4-7 1.069958519 0.814438451 1.325478587 ZT8-11 1.176436612 1.0965810555 1.2562921685000001 ZT12-15 1.843774322 1.513796111 2.173752533 ZT16-19 2.2350983325 1.886798598 2.583398067 ZT20-23 3.3442327602499997 3.312052221 3.3764132995