condition mean min max ZT0-3 1.46547344775 1.161876975 1.7690699204999998 ZT4-7 3.78833950025 2.168780756 5.4078982445 ZT8-11 12.561024 9.163724760000001 15.958323239999999 ZT12-15 12.87219928025 11.4684442525 14.275954308 ZT16-19 6.5123916975 6.1721627649999995 6.8526206300000005 ZT20-23 6.5753493425 6.2428269115 6.9078717735