condition mean min max ZT0-3 40.676065 40.676065 40.676065 ZT4-7 41.5835565 41.5835565 41.5835565 ZT8-11 45.1281605 45.1281605 45.1281605 ZT12-15 42.238665499999996 42.238665499999996 42.238665499999996 ZT16-19 33.5808265 33.5808265 33.5808265 ZT20-23 36.5373565 36.5373565 36.5373565