condition mean min max ZT0-3 22.0981 21.345399999999998 22.8508 ZT4-7 28.6981 28.6981 28.6981 ZT8-11 29.07465 29.07465 29.07465 ZT12-15 0 0 0 ZT16-19 33.7529 33.7529 33.7529 ZT20-23 24.43725 24.43725 24.43725