condition mean min max ZT0-3 184.191971 184.191971 184.191971 ZT4-7 219.314965 219.314965 219.314965 ZT8-11 294.32527400000004 294.32527400000004 294.32527400000004 ZT12-15 227.65396800000002 227.65396800000002 227.65396800000002 ZT16-19 389.7721465 389.7721465 389.7721465 ZT20-23 399.57201150000003 399.57201150000003 399.57201150000003