Most of the values count down from 100, so eg you power cycled this enough to reduce the count form 100 to 99, but it is ok until it reaches the threshold value

Most of the values count down from 100, so eg you power cycled this enough to reduce the count form 100 to 99, but it is ok until it reaches the threshold value of 0. So your drive is pretty new in terms of usage. You should run the short and long smartctl tests occasionally to get more reliable results though (smartctl -t short and smartctl -t long)