condition mean min max ZT0-3 0.712530551 0.669436593 0.755624509 ZT4-7 0.52457127675 0.325143954 0.7239985995 ZT8-11 0.60305149625 0.5553801165 0.650722876 ZT12-15 1.2983961 0.951315869 1.6454763309999998 ZT16-19 1.77493732475 1.73889381 1.8109808395 ZT20-23 1.9365120185 1.8563574310000002 2.016666606