Hello,<br/><br/>Is the following sentence correct?<br/><br/>He showed a similar level of cognition <u>as</u> his wife.<br/><br/>or<br/><br/>He showed a similar level of congition <u>to that of</u> his wife. ("that" is his wife's level of cognition.)<br/><br/>It seems like the first one is correct (like "He showed the same determination as his wife"), but I am confused.<br/><br/>Please help.