condition mean min max ZT0-3 14.924383333333335 10.739650000000001 18.14795 ZT4-7 9.06799 9.06799 9.06799 ZT8-11 10.86898 10.86898 10.86898 ZT12-15 22.8564 22.3497 23.363100000000003 ZT16-19 19.98565 19.98565 19.98565 ZT20-23 22.69795 22.69795 22.69795