condition mean min max ZT0-3 17.337516666666666 15.8675 20.2487 ZT4-7 21.76575 21.76575 21.76575 ZT8-11 27.16845 27.16845 27.16845 ZT12-15 45.4523 43.014849999999996 47.88975000000001 ZT16-19 28.7708 28.7708 28.7708 ZT20-23 23.28455 23.28455 23.28455