condition mean min max ZT0-3 8.180094405999998 7.846062421999999 8.51412639 ZT4-7 9.149542662 8.7403746105 9.5587107135 ZT8-11 12.6582148545 11.73386005 13.582569659 ZT12-15 19.4296607175 12.29549887 26.563822565 ZT16-19 45.206238825 40.995426894999994 49.417050755 ZT20-23 37.687920739999996 32.903423945 42.472417535