Before revision:  Additionally, if lockdowns had been instituted one to three weeks sooner , the number of Covid-19 deaths in New York could have been significantly reduced, but surprisingly not in Texas (perhaps due to aversion to lockdown and absence of a decree).
After revision:  Additionally, if lockdowns had been kept in place , the number of Covid-19 deaths in New York could have been significantly reduced, but surprisingly not in Texas (perhaps due to aversion to lockdown and absence of a decree).