condition mean min max ZT0-3 2.64508 2.64508 2.64508 ZT4-7 3.534395 3.534395 3.534395 ZT8-11 1.862285 1.862285 1.862285 ZT12-15 1.7905799999999998 1.7905799999999998 1.7905799999999998 ZT16-19 2.1841049999999997 2.1841049999999997 2.1841049999999997 ZT20-23 2.606335 2.606335 2.606335