condition mean min max ZT0-3 3.9023083455 2.428125949 5.376490742 ZT4-7 4.51435682925 4.4312126334999995 4.597501025 ZT8-11 2.4257762305 2.2450753254999998 2.6064771355 ZT12-15 1.25444961025 1.1467877545 1.362111466 ZT16-19 2.34452262825 1.807233853 2.8818114035 ZT20-23 3.48618192175 3.4688113234999998 3.50355252