condition mean min max ZT0-3 43.26075 43.26075 43.26075 ZT4-7 30.88125 30.88125 30.88125 ZT8-11 18.8395 18.8395 18.8395 ZT12-15 39.51095 39.51095 39.51095 ZT16-19 56.668549999999996 56.668549999999996 56.668549999999996 ZT20-23 51.393 51.393 51.393