condition mean min max ZT0-3 36.971418 36.971418 36.971418 ZT4-7 51.1702335 51.1702335 51.1702335 ZT8-11 51.297816999999995 51.297816999999995 51.297816999999995 ZT12-15 74.316508 74.316508 74.316508 ZT16-19 108.1827965 108.1827965 108.1827965 ZT20-23 106.310317 106.310317 106.310317