condition mean min max ZT0-3 11.033676 11.033676 11.033676 ZT4-7 10.782008000000001 10.782008000000001 10.782008000000001 ZT8-11 11.425224 11.425224 11.425224 ZT12-15 10.652642499999999 10.652642499999999 10.652642499999999 ZT16-19 11.008402 11.008402 11.008402 ZT20-23 10.523958499999999 10.523958499999999 10.523958499999999