condition mean min max ZT0-3 2553.98 2553.98 2553.98 ZT4-7 2382.1 2382.1 2382.1 ZT8-11 2035.2450000000001 2035.2450000000001 2035.2450000000001 ZT12-15 1585.415 1585.415 1585.415 ZT16-19 1830.27 1830.27 1830.27 ZT20-23 2137.2033333333334 2137.2033333333334 2137.2033333333334