condition mean min max ZT0-3 1.90855825 1.6943415000000002 2.122775 ZT4-7 1.843385 1.843385 1.843385 ZT8-11 2.189585 2.189585 2.189585 ZT12-15 0 0 0 ZT16-19 1.70437 1.70437 1.70437 ZT20-23 2.29115 2.29115 2.29115