condition mean min max ZT0-3 0.6409097687499999 0.607265411 0.6745541264999999 ZT4-7 1.8150380465 1.5165697749999998 2.113506318 ZT8-11 3.1271305775 2.614745742 3.639515413 ZT12-15 2.7002861507500002 2.6548144395 2.745757862 ZT16-19 2.43816248625 1.975804947 2.9005200255 ZT20-23 3.28077595625 3.062964 3.4985879124999997