condition mean min max ZT0-3 5.663503333333334 5.351850000000001 5.85342 ZT4-7 5.13197 5.13197 5.13197 ZT8-11 7.021045 7.021045 7.021045 ZT12-15 11.3175425 9.801485 12.8336 ZT16-19 11.847750000000001 11.847750000000001 11.847750000000001 ZT20-23 9.214305 9.214305 9.214305