condition mean min max ZT0-3 17.85485 17.85485 17.85485 ZT4-7 25.51405 25.51405 25.51405 ZT8-11 13.3277 13.3277 13.3277 ZT12-15 10.306740000000001 10.306740000000001 10.306740000000001 ZT16-19 8.744810000000001 8.744810000000001 8.744810000000001 ZT20-23 10.87715 10.87715 10.87715