condition mean min max ZT0-3 5.0611733333333335 3.207875 7.598655 ZT4-7 5.26493 5.26493 5.26493 ZT8-11 2.729675 2.729675 2.729675 ZT12-15 6.2633600000000005 5.237785 7.288935 ZT16-19 12.9709 12.9709 12.9709 ZT20-23 13.74405 13.74405 13.74405