condition mean min max ZT0-3 3.3279146705 2.75793557 3.8978937709999997 ZT4-7 3.468719504 3.075782887 3.861656121 ZT8-11 5.53237923075 4.2924240295 6.772334432 ZT12-15 7.987684098500001 7.886698838000001 8.088669359 ZT16-19 7.010739652249999 6.2978661695 7.723613134999999 ZT20-23 11.319211737749999 9.5642228705 13.074200605