Add age-specific odds ratios to adjust prob of HMB

[MObrien-IDM]

Kenya-specific numbers are not available, but we are going to use estimates from Tanzania (Ibrahim 2023)

15-19: 4.26 (adolescents are 4x more likely to report HMB than gen pop)
20-44: 0.63 (WRA are about 2/3 as likely to report HMB than gen pop)
45+: 0.95