Print To the editor: The finding that six women developed blood clots in the brain’s draining veins after they received the Johnson & Johnson COVID-19 vaccine is of concern. Yet the full context of federal agencies’ recommended pausing of the use of this vaccine requires additional information. The natural occurrence of such clots is approximately 13 people per million. More than 7 million Johnson & Johnson vaccines have been administered. Assuming half went into women’s arms, the math suggests we might see 45 with blood clots. Young women are a fraction of those who got the vaccine, but still, six out of 7 million may not be statistically different from background occurrence. Hormones and birth control medication are co-variables.