condition mean min max ZT0-3 5.3453599999999994 4.99458 5.69614 ZT4-7 5.771245 5.771245 5.771245 ZT8-11 15.245349999999998 15.245349999999998 15.245349999999998 ZT12-15 0 0 0 ZT16-19 9.63626 9.63626 9.63626 ZT20-23 10.861699999999999 10.861699999999999 10.861699999999999