condition mean min max ZT0-3 3.75309 3.75309 3.75309 ZT4-7 3.3463849999999997 3.3463849999999997 3.3463849999999997 ZT8-11 2.141025 2.141025 2.141025 ZT12-15 2.14817 2.14817 2.14817 ZT16-19 3.6109999999999998 3.6109999999999998 3.6109999999999998 ZT20-23 3.2206200000000003 3.2206200000000003 3.2206200000000003