condition mean min max ZT0-3 12.281320000000001 12.281320000000001 12.281320000000001 ZT4-7 8.834489999999999 8.834489999999999 8.834489999999999 ZT8-11 13.40565 13.40565 13.40565 ZT12-15 16.1052 16.1052 16.1052 ZT16-19 25.294033333333335 25.294033333333335 25.294033333333335 ZT20-23 23.233800000000002 23.233800000000002 23.233800000000002