Paediatric Inguinal Hernia & Hydrocele

Why they differ

The denominators are radically different: conditional on incarceration occurring (30% historically) ≠ inclusive of all waiters (1%) ≠ after a quiet planned repair (0.3%). There is no arithmetical conflict between them; the conflict is born only when any one of them is stripped of its denominator.

Adopted

The three are always published together with their denominators written, and in the parents' card they are presented in qualitative wording ('incarceration may harm the testicle — and speed and the planned operation are the protection') without headlining the 30%.

Justification

Deleting any layer misleads; the historical figure is kept because no newer pooled estimate exists for this specific conditional denominator — with it tagged '1984' wherever it appears (sources >10 years rule: the reasoning is written here).

Why they differ

The denominators are radically different: conditional on incarceration occurring (30% historically) ≠ inclusive of all waiters (1%) ≠ after a quiet planned repair (0.3%). There is no arithmetical conflict between them; the conflict is born only when any one of them is stripped of its denominator.

Adopted

The three are always published together with their denominators written, and in the parents' card they are presented in qualitative wording ('incarceration may harm the testicle — and speed and the planned operation are the protection') without headlining the 30%.

Justification

Deleting any layer misleads; the historical figure is kept because no newer pooled estimate exists for this specific conditional denominator — with it tagged '1984' wherever it appears (sources >10 years rule: the reasoning is written here).

Why they differ

Difference of denominator and age group before anything else: 11.9% has as its denominator infants and children under two years *actually waiting* for a scheduled operation (the highest-risk group, with the longest exposure to waiting), while 4.19% has as its denominator all diagnosed children up to age 15 — most of them older, and many repaired immediately so never exposed to waiting at all. And 7% sits between them with a mixed-age denominator. All three figures are correct inside their denominators and invalid outside them.

Adopted

Each group has its own figure, and there is no single general figure: for a child under two on a waiting list, 11.9% is published (Zamakhshary — the only large waiting study with open full text, and the group on which the timing decision is built).

Justification

Matching of group and definition to the actual clinical decision question ('what is the risk of waiting?'), and the source's strength (population-based cohort, multivariable) above the review's crude pooling (abstract-verified) and above the national register's denominator, which is broader than the question.

Why they differ

Difference of era and denominator: the 39% figure comes from a single old source that the guideline's introduction cited narratively, in an era when preterm repairs were delayed longer and the boundaries of 'preterm' were different; while 11% is a crude pooled rate from 22 relatively modern studies of children on waiting lists.

Adopted

11% (Olesen SR) for the group 'a preterm infant waiting for surgery', and 39% is kept in the dispute table only as a cited historical figure — it headlines no card.

Justification

The systematic review with its defined denominator is stronger than a narrative citation of a single old source, and the guideline itself built no recommendation on the 39% figure.

Why they differ

Difference of study design and practice environment: randomised trials are performed by experienced teams with unified protocols, while PHIS data are wide real-world practice (varying learning curves, administrative coding of recurrence that may confuse it with readmission, and technique choice that is not random — laparoscopy is chosen more for bilateral and smaller cases). And note that the open advantage in 'same-side recurrence' is matched in the same study by equality in 'any second hernia operation' after adjustment.

Adopted

The trials' wording: 'no proven difference; recurrence about 1% by either route' as a counselling figure, with PHIS shown in full in the dispute table.

Justification

Three poolings of randomised trials agreeing in direction outrank — in the project's hierarchy — a single administrative-register study at abstract level; but the size of PHIS (n=53,287) makes hiding it unacceptable, so it is displayed and explained, and not adopted as a headline until it is opened as full text and its definitions are audited.

Why they differ

In recurrence and respiratory complications the two sources agree completely (early repair is worse). The only disagreement is the direction of incarceration: the EUPSA pooling comes from raw retrospective cohorts — and 'early' repair in it was often in smaller, more fragile infants placed on a different pathway (confounding by indication) — while the newer, larger Hashmi pooling includes the randomised trial and adjusted estimates and finds early repair protective against incarceration, as expected mechanically (a repaired hernia does not incarcerate).

Adopted

No single timing figure — the full balance is published: repair before discharge protects against incarceration (OR 0.43, Hashmi) at the price of higher respiratory complications and recurrence (both sources agree), and the EUPSA recommendation (Grade B: delaying until after discharge *may* be beneficial) is the adopted guideline framework for the individual decision.

Justification

When directions conflict on one outcome while agreeing on the rest, the newest, largest and most comprehensively designed source (Hashmi) is adopted at the point of disagreement, and the guideline framework is kept for the decision — averaging the two ratios or choosing the one that suits the narrative is strictly forbidden. [Note 2026-11-08: the later adjudication below changed the absolute figures standing on the card; the delay framing remains as it is.] Later adjudication — 2026-11-08 (live UpToDate check + Tamer's adoption): the UpToDate topic 'Inguinal hernia in children' was opened (topic last updated: Mar 19, 2025; literature review to Oct 2026): it recommends deferring repair of hospitalised preterm infants until after discharge, at about 55 weeks postmenstrual age (Grade 2B) — confirming the delay framing adopted here — and presents the figures of a randomised trial in 122 preterm infants (early repair before NICU discharge vs late at 55 weeks): incarceration 3.5% early vs 12.3% late · post-operative apnoea 15.8% vs 4.6% · bronchopulmonary dysplasia 9.6% vs 1.5% · prolonged hospital stay 11% vs 2%. The trial's incarceration direction agrees with Hashmi and opposes the EUPSA Q4 pooling absolutes in the table above (18.1% early vs 11.3% late). Tamer's decision (2026-11-08): the EUPSA absolutes on the card are replaced by the randomised trial's absolutes as the standing absolute figures; the delay framing (EUPSA Grade B) remains a framework for the decision, not a source of figures; and the EUPSA absolutes remain in dispute table D5 above as documented history tagged as replaced, and do not appear on the cards. The odds ratios from Hashmi are unchanged; and recurrence OR 3.25 was not addressed by the UpToDate topic, so it remains from Hashmi as it is.

Why they differ

Difference of definition and mix: the guideline figure (92%) merges all types into one age group, and the split by type in Atıcı shows that the merge hides the decisive variable — the communicating hydrocele (whose processus is open by definition) rarely resolves (15%) while the non-communicating one usually resolves (93%). And the newborn series (83.4%) has a mix dominated by non-communicating cases diagnosed from birth, so it fell between the two figures, as expected from its mix.

Adopted

The split by type is the adopted counselling wording (Atıcı for the detailed figures + the guideline framework for duration: follow-up ≥12 months, and 95% of resolution before ~17 months as a time anchor); the guideline's pooled figure (92%) remains correct for its merged group and is cited attributed to the guideline, and is never used to reassure the parents of a child whose hydrocele is specifically communicating.

Justification

The figure closest to the definition of the individual patient's case outranks the pooled figure when they conflict in counselling, and the guideline itself builds its pathway (follow-up, then surgical closure of the processus for a persisting communicating case) on the same mechanical logic. ### 📘 Facebook post 1 — Signs of incarceration (from card PED-HRN-RISK-01 in its adopted wording)