Potential variables to be included in IPTW
| Potential variable | Association with reoffending within 18 months | Association with allocation to care farm | Include in IPTW |
| HR (95% CI) | OR (95% CI) | ||
| Age at recruitment: decades | 0.8 (0.6 to 1.07) | 0.87 (0.62 to 1.22) | |
| Gender: female versus male | 0.58 (0.27 to 1.26) | 0.07 (0.02 to 0.32) | |
| Has disability: yes versus no | 0.95 (0.42 to 2.18) | 2.84 (1.11 to 7.26) | |
| Probation type: NPS versus CRC | 0.08 (0.01 to 0.6) | 0.3 (0.08 to 1.09) | Yes |
| Used substances during the past 4 weeks: yes versus no | 2.06 (1.08 to 3.93) | 3.53 (1.53 to 8.16) | Yes |
| Smoker: yes versus no | 2.44 (1.11 to 5.36) | 2.72 (1.11 to 6.67) | Yes |
| OGRS at disposal: unit increase | 1.02 (1.01 to 1.03) | 1.02 (1.01 to 1.04) | Yes |
| Index of Multiple Deprivation: compared with most deprived quintile within cohort | 1.0 | 1.0 | |
| 2 | 2.87 (0.99 to 8.26) | 5 (1.17 to 21.46) | |
| 3 | 1.69 (0.53 to 5.34) | 7 (1.64 to 29.85) | |
| 4 | 1.58 (0.5 to 4.99) | 3.27 (0.72 to 14.73) | |
| 5—least deprived | 1.34 (0.42 to 4.21) | 2.72 (0.61 to 12.1) | |
| White British according to nDelius: no versus yes | 0.44 (0.17 to 1.15) | 0.14 (0.03 to 0.61) | |
| Disposal type: suspended sentence order versus CO | 0.62 (0.3 to 1.28) | 1.56 (0.7 to 3.44) | |
| Healthy foods are enjoyable: compared with strongly agree/agree | 1.0 | 1.0 | Yes |
| Neither agree nor disagree | 2.45 (1.17 to 5.14) | 3.51 (1.3 to 9.51) | |
| Disagree/strongly disagree | 2.95 (0.88 to 9.84) | 11.5 (1.22 to 108.02) |
Bolded values show significant.
CO, community order; CRC, Community Rehabilitation Company; IPTW, inverse-probability treatment weight; NPS, National Probation Service; OGRS, Offender Group Reconviction Scores.