condition mean min max ZT0-3 11.216154 11.216154 11.216154 ZT4-7 12.541540999999999 12.541540999999999 12.541540999999999 ZT8-11 11.463371 11.463371 11.463371 ZT12-15 12.302462 12.302462 12.302462 ZT16-19 12.135138999999999 12.135138999999999 12.135138999999999 ZT20-23 12.2230995 12.2230995 12.2230995