condition mean min max ZT0-3 12.489097 12.489097 12.489097 ZT4-7 11.661929 11.661929 11.661929 ZT8-11 13.105277000000001 13.105277000000001 13.105277000000001 ZT12-15 13.0499765 13.0499765 13.0499765 ZT16-19 12.383808 12.383808 12.383808 ZT20-23 11.0423865 11.0423865 11.0423865