condition mean min max ZT0-3 141.138065 141.138065 141.138065 ZT4-7 129.7325265 129.7325265 129.7325265 ZT8-11 135.3431015 135.3431015 135.3431015 ZT12-15 153.95674400000001 153.95674400000001 153.95674400000001 ZT16-19 175.881702 175.881702 175.881702 ZT20-23 175.3316525 175.3316525 175.3316525