| Variable | Description | Coding |
| age | Participant age in years | Continuous numeric |
| sex | Participant gender | 1 = Male; 2 = Female |
| right_eye_TT | Does the participant have the sign TT in the right eye? | 0 = No; 1 = Yes; 2 = Unable to examine |
| right_eye_TF | Does the participant have the sign TF in the right eye? | 0 = No; 1 = Yes; 2 = Unable to examine |
| right_eye_TI | Does the participant have the sign TI in the right eye? | 0 = No; 1 = Yes; 2 = Unable to examine |
| left_eye_TT | Does the participant have the sign TT in the left eye? | 0 = No; 1 = Yes; 2 = Unable to examine |
| left_eye_TF | Does the participant have the sign TF in the left eye? | 0 = No; 1 = Yes; 2 = Unable to examine |
| left_eye_TI | Does the participant have the sign TI in the left eye? | 0 = No; 1 = Yes; 2 = Unable to examine |
| consensus_f | Photograph F grade - see manuscript for grading scheme detail | 0 = Absent; 1 = Mild; 2 = Moderate; 3 = Severe |
| consensus_p | Photograph P grade - see manuscript for grading scheme detail | 0 = Absent; 1 = Mild; 2 = Moderate; 3 = Severe |
| consensus_c | Photograph C grade - see manuscript for grading scheme detail | 0 = Absent; 1 = Mild; 2 = Moderate; 3 = Severe |
| comment_atypical | Whether photograders specifically noted C2/C3 grades were atypical of trachomatous scarring | 0 = No; 1 = Yes |
| OD_200_norm | Optical density at 450nm, normalised to 20% dilution of high-titre serum in low-titre serum | Continuous numeric |
| pgp3_result | Is the participant antibody levels above the specified positivity threshold? | 0 = No; 1 = Yes |
| Ct_plasmid_result | Did the participant's conjunctival swab have a positive Chlamydia trachomatis plasmid ddPCR result? | 0 = No; 1 = Yes |
| Hs_RPP30_result | Did the participant's conjunctival swab have a positive endogenous control ddPCR result? | 0 = No; 1 = Yes |
| Ct_plasmid_copies_swab | Chlamydia trachomatis plasmid load (number of copies per swab) | Continuous numeric |
| Hs_RPP30_copies_swab | Endogenous control load (number of copies per swab) | Continuous numeric |
| province | Which province does the participant live in? | Text field |