condition mean min max ZT0-3 13.245061666666667 10.084785 15.979000000000001 ZT4-7 7.12881 7.12881 7.12881 ZT8-11 5.80596 5.80596 5.80596 ZT12-15 5.0290300000000006 4.97498 5.08308 ZT16-19 6.151120000000001 6.151120000000001 6.151120000000001 ZT20-23 10.851115 10.851115 10.851115