condition mean min max ZT0-3 21.726284682499998 17.38837297 26.064196394999996 ZT4-7 12.620452827500001 10.666593195 14.574312460000002 ZT8-11 14.536524705000001 11.616084010000002 17.4569654 ZT12-15 14.16508875625 12.197445827500001 16.132731685 ZT16-19 15.004385342500001 13.967657665 16.04111302 ZT20-23 12.13893059225 10.1581356895 14.119725495