condition mean min max ZT0-3 39.3738932275 37.023530805 41.724255649999996 ZT4-7 38.265125993333335 37.34604753666667 39.18420445 ZT8-11 36.864322145 34.71795751 39.01068678 ZT12-15 30.73317209 25.26730312 36.19904106 ZT16-19 23.266689293333336 22.8221605 23.71121808666667 ZT20-23 21.56474494 21.137294943333334 21.992194936666667