condition mean min max ZT0-3 3.9458379 3.901781251 3.9898945489999997 ZT4-7 4.6246541645 3.8191638859999997 5.430144443 ZT8-11 7.413417782249999 5.888308346 8.938527218499999 ZT12-15 10.318187658749999 9.426230976 11.2101443415 ZT16-19 7.0673607505 6.7879419604999995 7.3467795405 ZT20-23 7.627380183750001 7.553017175 7.7017431925