condition mean min max ZT0-3 51.491375 47.27485 55.707899999999995 ZT4-7 30.83605 30.83605 30.83605 ZT8-11 34.7251 34.7251 34.7251 ZT12-15 0 0 0 ZT16-19 48.4934 48.4934 48.4934 ZT20-23 47.525 47.525 47.525