condition mean min max ZT0-3 5.3207249999999995 5.3207249999999995 5.3207249999999995 ZT4-7 3.316775 3.316775 3.316775 ZT8-11 3.8071349999999997 3.8071349999999997 3.8071349999999997 ZT12-15 4.39391 4.39391 4.39391 ZT16-19 7.618295 7.618295 7.618295 ZT20-23 6.0123750000000005 6.0123750000000005 6.0123750000000005