In this series, we are analyzing 1,000,000 deals which were played on-line. These deals cover a wide range of level of play and were provided by Stephen Pickett with Bridge Browser.
When the final contract was 1NT, it was set about 29% of the time and made 71% of the time (often with overtricks).
Here is how many tricks were taken (in order of frequency):
7 -- on 25% of all 1NT contracts
8 -- on 23% of all 1NT contracts
6 -- on 17% of all 1NT contracts