condition mean min max ZT0-3 35.784975 32.42305 39.1469 ZT4-7 46.65715 46.65715 46.65715 ZT8-11 46.623000000000005 46.623000000000005 46.623000000000005 ZT12-15 0 0 0 ZT16-19 52.60295 52.60295 52.60295 ZT20-23 40.9834 40.9834 40.9834