condition mean min max ZT0-3 5.9741780245000005 5.711375404 6.236980645 ZT4-7 6.275619131499999 5.753424716 6.797813547 ZT8-11 6.498680372 5.824783319333333 7.172577424666667 ZT12-15 7.817159778000001 7.7804409670000005 7.853878589 ZT16-19 9.665320024166668 8.890632696333334 10.440007352 ZT20-23 8.474784794166666 8.292349997 8.657219591333334