unit14 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. |
| intervention_type | textharmonize | The cognitive training or perioperative care this unit received, as a short noun phrase naming the delivered activity (e.g., "tablet-based cognitive exercises", "usual care", "sham non-adaptive puzzles", "physical prehabilitation"). Capture the paper's label for what was administered to this arm, not the review arm label. |
| training_sessions_total | number | Total number of cognitive-training sessions prescribed for this unit (count of planned sessions across the full program). not_applicable for arms with no cognitive training (standard_care or sham_control without a training schedule). Prefer the protocol-prescribed total over sessions actually completed; completed-session counts belong in training_adherence. |
| training_frequency | text | How often cognitive-training sessions were scheduled, as a short phrase (e.g., "daily", "3x/week", "twice daily"). not_applicable for arms with no cognitive training. Report the planned schedule, not adherence-adjusted frequency. |
| session_duration_minutes | number | Planned duration of each cognitive-training session in minutes. Convert from hours if reported that way (× 60). Use the per-session planned length, not total program contact time. not_applicable for arms with no cognitive training. |
| training_overall_duration_days | number | Overall length of the cognitive-training program in days, from first to last scheduled session. Convert from weeks (× 7) or months (× 30) so values remain whole and comparable; do not leave in mixed units. not_applicable for arms with no cognitive training. |
| training_delivery | textharmonize | How and by whom the cognitive training was administered, as a short phrase covering modality and supervisor (e.g., "self-administered app", "therapist-led in person", "neuropsychologist-supervised", "researcher-supervised tablet"). not_applicable for arms with no cognitive training. |
| training_timing | preoperativepostoperativeperioperative | When this unit's cognitive training was delivered relative to the index surgery. preoperative = entirely before surgery; postoperative = entirely after surgery; perioperative = spanning both pre- and post-operative periods. Required for the pre-/post-/peri-operative subgroup analysis — classify from the intervention schedule, not from when outcomes were assessed. not_applicable for an arm receiving no cognitive training. |
| training_adherence | number | Proportion of prescribed cognitive-training sessions this unit actually completed, as a percentage. Use the paper's own adherence, compliance, or completion figure directly; do not derive a rate from dropout or withdrawal counts alone. not_applicable for an arm with no cognitive training; not_reported when the paper gives no completion/adherence figure. |
| preop_cognitive_impairment_percent | number | Percentage of this unit with preexisting cognitive impairment at baseline, per the paper's stated definition or threshold. Calculate complement if only the unimpaired proportion is given. not_reported if the paper does not state the proportion in this unit (including when impairment was an exclusion and no baseline prevalence is given). |