condition mean min max ZT0-3 1.08215 1.08215 1.08215 ZT4-7 1.261511 1.261511 1.261511 ZT8-11 0.458654 0.458654 0.458654 ZT12-15 0.836505 0.836505 0.836505 ZT16-19 2.21457 2.21457 2.21457 ZT20-23 1.4591349999999998 1.4591349999999998 1.4591349999999998