There were two interesting twists in their findings. The first was that bad was stronger than good, as is almost always the case in psychology.[55] Depression was significantly more contagious than happiness or good mental health. The second twist was that depression spread only from women. When a woman became depressed, it increased the odds of depression in her close friends (male and female) by 142%. When a man became depressed, it had no measurable effect on his friends.
