Thyroid: what evidence wins at the Board

For thyroid appeals, how often the Board granted the issue when the record held each kind of evidence, and how often when it did not. Measured from the decisions themselves; every number carries its fraction.

What this is computed from: evidence types detected in the full text of 1,929,585 public Board of Veterans' Appeals decisions (va.gov/vetapp), joined to the issue-level outcome. The tables use only single-issue decisions with a clean parse in complete crawl years (1992–2025) — 971,127 decisions — so each evidence flag attaches to exactly one decided issue. A split is shown only when both sides have at least 30 decisions. Every count opens its decisions in the Board decision finder, with links to the full text on va.gov. Data build: 2026-10-16.

Service connection for Thyroid (n = 1,344)

When the record had…Granted, with itGranted, without itDifferenceRemanded, with it
A medical source gave a positive nexus opinionEvidence in the record65% (70/108)42% (249/586)+22 pts21% (29/138)
Private physician opinion, letter or DBQEvidence in the record53% (78/148)44% (241/546)+9 pts27% (55/204)
Disability Benefits Questionnaire in the recordEvidence in the record74% (25/34)45% (294/660)+29 pts40% (23/57)
Service treatment records document the condition or injuryEvidence in the record30% (59/194)52% (260/500)-22 pts31% (88/286)
Service treatment records silent for the conditionEvidence in the record18% (47/266)64% (272/428)-46 pts17% (57/328)
Continuity of symptoms argued (38 CFR 3.303(b))Theory argued23% (44/192)55% (275/502)-32 pts10% (22/215)
Board hearing held or testimony takenProcedure45% (138/308)47% (181/386)-2 pts42% (238/560)
Medical literature or treatise citedEvidence in the record32% (60/188)51% (259/506)-19 pts39% (119/308)
Presumptive service connection discussedTheory argued46% (259/560)45% (60/134)+1 pts28% (221/790)
Secondary service connection (38 CFR 3.310) in playTheory argued37% (80/215)50% (239/479)-13 pts37% (126/345)
Combat service / 1154(b) in playTheory argued46% (23/50)46% (296/644)+0 pts23% (16/69)
A medical source gave a negative nexus opinionEvidence in the record36% (107/295)53% (212/399)-17 pts39% (190/487)
No nexus opinion of recordEvidence in the record2% (1/44)49% (318/650)-47 pts17% (9/53)
VA examination or VA medical opinion obtainedEvidence in the record39% (181/465)60% (138/229)-21 pts46% (409/883)
Board found a VA exam or opinion inadequateHow the Board read the record48% (59/124)46% (260/570)+2 pts61% (198/322)
Board found the veteran's statements credibleHow the Board read the record54% (20/37)46% (299/657)+9 pts14% (6/43)
Benefit of the doubt resolved in the veteran's favorHow the Board read the record94% (101/108)37% (218/586)+56 pts1% (1/109)
Preponderance of the evidence against / doctrine not applicableHow the Board read the record1% (3/259)73% (316/435)-71 pts0% (0/259)
Board ordered a new exam or addendum opinionProcedure20% (16/79)49% (303/615)-29 pts84% (424/506)
AMA favorable finding acknowledgedProcedure76% (104/137)39% (215/557)+37 pts30% (59/196)

"Granted" = share of issues decided on the merits (granted + denied); remands and dismissals are excluded from that fraction and shown separately. Fractions are the raw counts.

Increased rating for Thyroid (n = 569)

When the record had…Granted, with itGranted, without itDifferenceRemanded, with it
Private physician opinion, letter or DBQEvidence in the record41% (15/37)20% (45/222)+20 pts24% (12/49)
Service treatment records document the condition or injuryEvidence in the record13% (4/31)25% (56/228)-12 pts11% (4/35)
Board hearing held or testimony takenProcedure28% (27/95)20% (33/164)+8 pts51% (104/202)
Secondary service connection (38 CFR 3.310) in playTheory argued23% (16/70)23% (44/189)-0 pts32% (34/105)
A medical source gave a negative nexus opinionEvidence in the record25% (12/48)23% (48/211)+2 pts21% (13/61)
Board found a VA exam or opinion inadequateHow the Board read the record28% (9/32)22% (51/227)+6 pts76% (103/135)
Board found the VA exam or opinion adequateHow the Board read the record17% (6/36)24% (54/223)-8 pts0% (0/36)
Benefit of the doubt resolved in the veteran's favorHow the Board read the record84% (26/31)15% (34/228)+69 pts3% (1/32)
Preponderance of the evidence against / doctrine not applicableHow the Board read the record10% (13/134)38% (47/125)-28 pts0% (0/134)

"Granted" = share of issues decided on the merits (granted + denied); remands and dismissals are excluded from that fraction and shown separately. Fractions are the raw counts.

All Thyroid issues, every benefit type (n = 2,217)

When the record had…Granted, with itGranted, without itDifferenceRemanded, with it
A medical source gave a positive nexus opinionEvidence in the record62% (75/120)38% (384/1,016)+25 pts20% (31/152)
Private physician opinion, letter or DBQEvidence in the record49% (99/203)39% (360/933)+10 pts26% (73/278)
Disability Benefits Questionnaire in the recordEvidence in the record60% (38/63)39% (421/1,073)+21 pts59% (91/154)
Third-party lay statements (spouse, buddy, employer)Evidence in the record38% (15/40)41% (444/1,096)-3 pts25% (13/53)
Service treatment records document the condition or injuryEvidence in the record29% (68/238)44% (391/898)-15 pts28% (93/335)
Service treatment records silent for the conditionEvidence in the record18% (49/275)48% (410/861)-30 pts17% (58/338)
Continuity of symptoms argued (38 CFR 3.303(b))Theory argued24% (47/198)44% (412/938)-20 pts10% (23/222)
Board hearing held or testimony takenProcedure41% (193/471)40% (266/665)+1 pts43% (376/868)
Medical literature or treatise citedEvidence in the record31% (65/209)43% (394/927)-11 pts41% (143/353)
Functional loss / DeLuca factors argued (rating cases)Theory argued39% (14/36)40% (445/1,100)-2 pts24% (12/49)
Presumptive service connection discussedTheory argued45% (268/591)35% (191/545)+10 pts28% (231/831)
Secondary service connection (38 CFR 3.310) in playTheory argued33% (107/323)43% (352/813)-10 pts34% (172/501)
Combat service / 1154(b) in playTheory argued38% (23/60)41% (436/1,076)-2 pts26% (22/85)
A medical source gave a negative nexus opinionEvidence in the record35% (125/360)43% (334/776)-8 pts36% (206/568)
No nexus opinion of recordEvidence in the record4% (2/47)42% (457/1,089)-38 pts18% (10/57)
VA examination or VA medical opinion obtainedEvidence in the record35% (297/837)54% (162/299)-19 pts46% (733/1,583)
Board found a VA exam or opinion inadequateHow the Board read the record45% (79/175)40% (380/961)+6 pts65% (331/506)
Board found the VA exam or opinion adequateHow the Board read the record22% (15/69)42% (444/1,067)-20 pts4% (3/72)
Board found the veteran's statements credibleHow the Board read the record61% (41/67)39% (418/1,069)+22 pts9% (7/74)
Benefit of the doubt resolved in the veteran's favorHow the Board read the record90% (136/151)33% (323/985)+57 pts1% (2/154)
Preponderance of the evidence against / doctrine not applicableHow the Board read the record5% (25/459)64% (434/677)-59 pts0% (0/459)
Board ordered a new exam or addendum opinionProcedure22% (27/122)43% (432/1,014)-20 pts85% (722/847)
AMA favorable finding acknowledgedProcedure74% (109/147)35% (350/989)+39 pts29% (61/208)

"Granted" = share of issues decided on the merits (granted + denied); remands and dismissals are excluded from that fraction and shown separately. Fractions are the raw counts.

Reading these tables honestly

Association, not cause. A positive nexus opinion appears in the records of granted appeals far more often than in denied ones. That does not mean any letter wins; it means the Board grants when the evidence supports the claim, and a nexus opinion is how that support usually reaches the file.

Appeals are not claims. Every decision here is an appealed denial. Grant rates at the Board say nothing about the share of initial claims VA grants.

Findings are outcomes in disguise. Rows under "how the Board read the record" — credibility, benefit of the doubt, an inadequate exam — describe how the judge decided, not evidence to gather. They are shown because they say which arguments the Board actually reaches for.

Detection is by text pattern. Each evidence type is found by reading the decision for finding-shaped language with negation handling; precision was read on samples before publication and is stated per feature in the method notes below. Expect a few percent of misclassified rows, not zero.

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