condition mean min max ZT0-3 13.50103867 13.43433179 13.56774555 ZT4-7 16.212729942499998 13.91278876 18.512671124999997 ZT8-11 31.80876108 22.257161840000002 41.36036032 ZT12-15 70.97862485750001 68.86346215500001 73.09378756000001 ZT16-19 62.6050826 58.078339705 67.131825495 ZT20-23 50.545869530000004 49.51243119 51.57930787