condition mean min max ZT0-3 751.635735 751.635735 751.635735 ZT4-7 659.9111395 659.9111395 659.9111395 ZT8-11 626.777476 626.777476 626.777476 ZT12-15 773.442646 773.442646 773.442646 ZT16-19 727.79804 727.79804 727.79804 ZT20-23 710.7123925000001 710.7123925000001 710.7123925000001