condition mean min max ZT0-3 3.39836 1.76497 4.768485 ZT4-7 1.401661 1.401661 1.401661 ZT8-11 2.311755 2.311755 2.311755 ZT12-15 4.816179999999999 3.912745 5.719614999999999 ZT16-19 4.731730000000001 4.731730000000001 4.731730000000001 ZT20-23 6.736785 6.736785 6.736785