condition mean min max ZT0-3 1567.2397655 1551.218256 1583.2612749999998 ZT4-7 1921.64876575 1627.6056039999999 2215.6919275 ZT8-11 1295.7044180999999 971.2032062 1620.20563 ZT12-15 182.7801381925 150.30201803 215.258258355 ZT16-19 541.963167975 409.0554869 674.87084905 ZT20-23 967.28077935 870.9915871000001 1063.5699716