The minimum number of colleagues you could have had to arrive at those ratios is 400. Assuming you've had 400 colleagues, we can break down your ratios into: -

The minimum number of colleagues you could have had to arrive at those ratios is 400. Assuming you've had 400 colleagues, we can break down your ratios into: - 380 men - 19 women producing good code - 1 woman producing bad code I think the error bars on that one woman would be quite large, too large to draw any conclusions. Now if I guessed wrong and you've actually had not 400, but tens of thousands of colleagues who you've been secretly tracking and ranking in your spare time, maybe you'd have enough data to draw a conclusion.