condition mean min max ZT0-3 2542.6 2542.6 2542.6 ZT4-7 1522.8 1522.8 1522.8 ZT8-11 1484.0500000000002 1484.0500000000002 1484.0500000000002 ZT12-15 2084.1 2084.1 2084.1 ZT16-19 2446.4 2446.4 2446.4 ZT20-23 2815.3999999999996 2815.3999999999996 2815.3999999999996