condition mean min max ZT0-3 132.30898 132.30898 132.30898 ZT4-7 107.435339 107.435339 107.435339 ZT8-11 138.6885685 138.6885685 138.6885685 ZT12-15 178.66115150000002 178.66115150000002 178.66115150000002 ZT16-19 208.905805 208.905805 208.905805 ZT20-23 252.799163 252.799163 252.799163