condition mean min max ZT0-3 3159.280911 3159.280911 3159.280911 ZT4-7 3722.011429 3722.011429 3722.011429 ZT8-11 3948.9306295 3948.9306295 3948.9306295 ZT12-15 3714.4120015 3714.4120015 3714.4120015 ZT16-19 3499.3698010000003 3499.3698010000003 3499.3698010000003 ZT20-23 2969.3383615000002 2969.3383615000002 2969.3383615000002