Table 1.

 Estimated red blood cell folate concentrations associated with specified levels of risk of neural tube defect among participants in Community Intervention Project

Neural tube defect risk per 10 000 births	Red blood cell folate concentration (nmol/L)*	95% uncertainty interval†
40	380	320 to 449
20	580	510 to 640
10	870	790 to 960
6	1180	1050 to 1340
5	1310	1150 to 1520

Estimates were derived using estimated parameters of neural tube defect risk model; details on model, underlying assumptions, and methods used to develop estimates are provided in supplementary material.

*Median (rounded to nearest 10) of posterior distribution for possible values of red blood cell folate concentration associated with specified level of neural tube defect risk.

†Lower value of this interval is 2.5th centile of posterior distribution for possible values of red blood cell folate concentration associated with specified level of neural tube defect risk; upper value is 97.5th centile of distribution.