condition mean min max ZT0-3 2985.193595 2985.193595 2985.193595 ZT4-7 3543.655885 3543.655885 3543.655885 ZT8-11 3597.5871150000003 3597.5871150000003 3597.5871150000003 ZT12-15 3422.2851 3422.2851 3422.2851 ZT16-19 2383.9174115 2383.9174115 2383.9174115 ZT20-23 2199.6043855 2199.6043855 2199.6043855