condition mean min max ZT0-3 11.8364 11.8364 11.8364 ZT4-7 11.87235 11.87235 11.87235 ZT8-11 9.299805 9.299805 9.299805 ZT12-15 8.546155 8.546155 8.546155 ZT16-19 10.03719 10.03719 10.03719 ZT20-23 11.1258 11.1258 11.1258