condition mean min max ZT0-3 11.4719 11.4719 11.4719 ZT4-7 8.6709 8.6709 8.6709 ZT8-11 8.918285000000001 8.918285000000001 8.918285000000001 ZT12-15 10.4876 10.4876 10.4876 ZT16-19 15.06865 15.06865 15.06865 ZT20-23 14.33105 14.33105 14.33105