condition mean min max ZT0-3 3.0212775 2.8141 3.2284550000000003 ZT4-7 3.29756 3.29756 3.29756 ZT8-11 3.53234 3.53234 3.53234 ZT12-15 0 0 0 ZT16-19 4.145465 4.145465 4.145465 ZT20-23 3.635705 3.635705 3.635705