condition mean min max ZT0-3 39.912475401500004 21.203850303000003 58.6211005 ZT4-7 6.52730735225 6.458849384 6.5957653205 ZT8-11 5.25162944325 5.000747388 5.5025114985 ZT12-15 4.917112890249999 4.134462532 5.6997632485 ZT16-19 3.668600864 2.8506233345 4.4865783935 ZT20-23 5.52636079975 5.038710078499999 6.014011521