condition mean min max ZT0-3 11.731186 11.731186 11.731186 ZT4-7 12.4310315 12.4310315 12.4310315 ZT8-11 11.513747500000001 11.513747500000001 11.513747500000001 ZT12-15 10.550034499999999 10.550034499999999 10.550034499999999 ZT16-19 11.6022605 11.6022605 11.6022605 ZT20-23 12.8140985 12.8140985 12.8140985