unit19 fields
| sample_size | number | Participants allocated/enrolled to this unit — the randomized or baseline-characteristics-table N, before attrition. Do NOT use the analyzed/complete-case N when they differ under dropout. Prefer the baseline Table 1 N; fall back to the CONSORT 'allocated' count. |
| age_years | average | Age at enrollment/baseline in years. |
| female_percent | number | Percentage female in this unit. Calculate the complement if only male is given (60% male = 40% female). If the cohort is sex-restricted by procedure or eligibility, infer accordingly (a female-only procedure → 100; a male-only procedure → 0). |
| withdrawals | number | Participants in this unit who withdrew consent or discontinued participation between randomization/enrollment and final analysis. Count only consent-withdrawal and active discontinuation — do not include participants who remained enrolled but were not reached for follow-up. |
| lost_to_follow_up | number | Participants in this unit who remained enrolled but could not be reached for the final outcome assessment. Count only contact-loss with retained consent. If the paper reports a single combined count without distinguishing consent-withdrawal from contact-loss, record the combined count here and note the combined nature in the comment. |
| donor_count | number | Number of actual liver donors contributing organs in this unit. Restrict to the liver donor subset when a multi-organ procurement series reports pooled all-organ donor counts; if only a pooled multi-organ donor N is given with no liver breakout, mark ambiguous. |
| donor_age_years | average | Donor age at donation in years. Prefer the liver-donor subset when multi-organ series report age only for the pooled donor cohort. |
| donor_male_percent | number | Percentage of donors who are male in this unit. Calculate complement if only female given (60% female = 40% male). Restrict to the liver-donor subset when multi-organ series pool sexes across organs. |
| donor_cause_of_death | textharmonize | Primary cause(s) of donor death as reported for this unit. Format as a short noun phrase or comma-separated list when multiple causes are tabulated (e.g., "trauma", "anoxia, CVA"). Prefer cause distribution specific to liver donors over pooled multi-organ figures. |
| functional_warm_ischemia_time_minutes | average | Functional warm ischemia time in minutes for donors in this unit, from the paper's stated fWIT start (commonly systolic BP <50 mmHg or oxygen saturation threshold) to cold perfusion or NRP start. Convert from hours if needed. Do not substitute total warm ischemia, agonal-phase duration, or asystole-to-perfusion time when fWIT is not reported; those belong in the comment only. |
| donor_risk_index | average | Donor Risk Index (DRI) or liver-specific donor risk score as reported for this unit. Extract the named index value; if both DRI and a modified/UK DRI variant are given, prefer the score the paper uses in adjusted outcome models and name the instrument in the comment. |
| recipient_age_years | average | Liver transplant recipient age at transplantation in years for this unit. Restrict to liver recipients when multi-organ series report pooled recipient age. |
| recipient_male_percent | number | Percentage of liver transplant recipients who are male in this unit. Calculate complement if only female given (60% female = 40% male). Restrict to the liver-recipient subset in multi-organ series. |
| recipient_meld_score | average | Recipient MELD or MELD-Na score at transplant for this unit. Prefer laboratory MELD at allocation/transplant over exception or listing MELD when both are reported; name the variant in the comment. |
| nrp_type | TA-NRPA-NRPmixed | NRP configuration used for liver recovery in this unit. TA-NRP = thoracoabdominal NRP; A-NRP = abdominal-only NRP; mixed = unit pools both configurations. not_applicable on scs, mp, and dnc units. Do not infer type from cannula description or center habit when the paper is silent — use not_reported. When mixed, record per-type counts in the comment if given. |
| nrp_duration_minutes | average | Duration of in-situ NRP in minutes from NRP start to cessation/cross-clamp for livers in this unit. Convert from hours if needed. not_applicable on scs, mp, and dnc units that never received NRP. |
| nrp_temperature_celsius | average | Target or measured NRP perfusate temperature in degrees Celsius for this unit. not_applicable on scs, mp, and dnc units. If a range is given without a central value, record the midpoint and note the range in the comment. |
| heparin_timing | pre-mortempost-mortem | When systemic heparin was administered relative to circulatory death declaration during DCC recovery. pre-mortem = given before withdrawal of life-sustaining therapy or before death declaration; post-mortem = given only after death declaration or at NRP/cannulation start. not_applicable on dnc units and on units with no heparin policy stated as part of a non-DCC pathway. A study silent on timing is not_reported, not post-mortem. |
| preservation_adjunct | textharmonize | Ex-situ preservation method used after recovery (and after NRP when applicable) for livers in this unit. Format as a short noun phrase naming modality and any device (e.g., "static cold storage", "NMP (OrganOx Metra)", "HMP (Liver Assist)", "SCS then NMP"). Capture the post-recovery pathway only — do not restate the in-situ NRP step here. |