condition mean min max ZT0-3 1719.394117 1719.394117 1719.394117 ZT4-7 3710.457383 3710.457383 3710.457383 ZT8-11 6325.712826 6325.712826 6325.712826 ZT12-15 2692.534112 2692.534112 2692.534112 ZT16-19 10522.085716 10522.085716 10522.085716 ZT20-23 7683.994443500001 7683.994443500001 7683.994443500001