condition mean min max ZT0-3 22.452558935749998 19.0246194715 25.8804984 ZT4-7 4.29899189525 3.4588325915 5.1391511990000005 ZT8-11 3.89371572875 2.7375569295 5.049874528 ZT12-15 7.0913871442500005 5.242770006500001 8.940004282 ZT16-19 10.19473237 9.584339535000002 10.805125205 ZT20-23 15.8381354575 15.62238107 16.053889845