condition mean min max ZT0-3 10.053163 10.053163 10.053163 ZT4-7 11.930271 11.930271 11.930271 ZT8-11 10.7627685 10.7627685 10.7627685 ZT12-15 9.699136 9.699136 9.699136 ZT16-19 11.0231435 11.0231435 11.0231435 ZT20-23 9.9542705 9.9542705 9.9542705