condition mean min max ZT0-3 7.27303987275 6.1024983504999994 8.443581395 ZT4-7 3.59956652525 3.5985117225 3.600621328 ZT8-11 3.628757293 3.0531047530000004 4.204409833 ZT12-15 3.723779115 3.6267053055000003 3.8208529245 ZT16-19 5.866350616 4.9848978595 6.7478033725 ZT20-23 9.940398913500001 9.905863048 9.974934779