condition mean min max ZT0-3 2.833885 2.63635 3.03142 ZT4-7 2.9153149999999997 2.9153149999999997 2.9153149999999997 ZT8-11 2.4616350000000002 2.4616350000000002 2.4616350000000002 ZT12-15 0 0 0 ZT16-19 2.846355 2.846355 2.846355 ZT20-23 2.830905 2.830905 2.830905