condition mean min max ZT0-3 3.054486106 2.975716127 3.133256085 ZT4-7 2.95995247875 2.6887398045 3.231165153 ZT8-11 2.9198336950000003 2.7797331965 3.0599341935 ZT12-15 3.0359844125 2.986070565 3.08589826 ZT16-19 2.415478685 2.0738113365000004 2.7571460335 ZT20-23 4.348127025749999 4.254786451999999 4.4414675995