condition mean min max ZT0-3 15.177212 15.177212 15.177212 ZT4-7 16.4015105 16.4015105 16.4015105 ZT8-11 15.179686499999999 15.179686499999999 15.179686499999999 ZT12-15 13.798935499999999 13.798935499999999 13.798935499999999 ZT16-19 12.775954500000001 12.775954500000001 12.775954500000001 ZT20-23 14.126148 14.126148 14.126148