condition mean min max ZT0-3 728.186243 728.186243 728.186243 ZT4-7 663.386269 663.386269 663.386269 ZT8-11 577.852619 577.852619 577.852619 ZT12-15 622.842212 622.842212 622.842212 ZT16-19 503.73111700000004 503.73111700000004 503.73111700000004 ZT20-23 492.09523249999995 492.09523249999995 492.09523249999995