condition mean min max ZT0-3 1049.734155 1049.734155 1049.734155 ZT4-7 644.0849765 644.0849765 644.0849765 ZT8-11 805.4755275 805.4755275 805.4755275 ZT12-15 857.2254465000001 857.2254465000001 857.2254465000001 ZT16-19 1005.8981785 1005.8981785 1005.8981785 ZT20-23 1115.315562 1115.315562 1115.315562