condition mean min max ZT0-3 45.622073615000005 37.68921975 53.55492748 ZT4-7 9.648346132 6.522317222 12.774375041999999 ZT8-11 9.9154127045 5.6194498215 14.2113755875 ZT12-15 19.622324847499996 19.58563 19.659019694999998 ZT16-19 23.239258042499998 23.02462392 23.453892165 ZT20-23 21.459406174999998 20.60448276 22.31432959