My answer assumes your strategy is to be net short premium.
There are several ways to look at this.
Trade logic suggests a selling a iron condor is useful when a trader has a neutral outlook. Therefore, if the price of the underlying reaches the 1 standard deviation level, that outlook may be considered invalidated. It seems to me the most efficient, risk defined strategy in a neutral scenario is a iron butterfly or tight iron condor around the current price of the underlying. For protection, either buy the 1 or 2 standard deviation options, or say the .16 or .025 delta levels.