condition mean min max ZT0-3 29.493949999999998 15.0114 38.48605 ZT4-7 16.18905 16.18905 16.18905 ZT8-11 13.36335 13.36335 13.36335 ZT12-15 20.014024999999997 19.584 20.444049999999997 ZT16-19 39.60965 39.60965 39.60965 ZT20-23 57.6066 57.6066 57.6066