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636281 occurrences (No.11 in the rank) during 5 years in the PubMed. [no cache] 500 found

83) Furthermore, randomness of treatment allocation could be significantly compromised because of the high proportion of deterministic assignments associated with stratified block randomization and minimization, potentially resulting in selection bias.

--- ABSTRACT ---

PMID:22287602 DOI:10.1177/0962280212436447

2015 Statistical methods in medical research

* Minimal sufficient balance-a new strategy to balance baseline covariates and preserve randomness of treatment allocation.

- In many clinical trials, baseline covariates could affect the primary outcome. Commonly used strategies to balance baseline covariates include stratified constrained randomization and minimization. Stratification is limited to few categorical covariates. Minimization lacks the randomness of treatment allocation. Both apply only to categorical covariates. As a result, serious imbalances could occur in important baseline covariates not included in the randomization algorithm. Furthermore, randomness of treatment allocation could be significantly compromised because of the high proportion of deterministic assignments associated with stratified block randomization and minimization, potentially resulting in selection bias. Serious baseline covariate imbalances and selection biases often contribute to controversial interpretation of the trial results. The National Institute of Neurological Disorders and Stroke recombinant tissue plasminogen activator Stroke Trial and the Captopril Prevention Project are two examples. In this article, we propose a new randomization strategy, termed the minimal sufficient balance randomization, which will dually prevent serious imbalances in all important baseline covariates, including both categorical and continuous types, and preserve the randomness of treatment allocation. Computer simulations are conducted using the data from the National Institute of Neurological Disorders and Stroke recombinant tissue plasminogen activator Stroke Trial. Serious imbalances in four continuous and one categorical covariate are prevented with a small cost in treatment allocation randomness. A scenario of simultaneously balancing 11 baseline covariates is explored with similar promising results. The proposed minimal sufficient balance randomization algorithm can be easily implemented in computerized central randomization systems for large multicenter trials.

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(1)18 risk	(19)4 gamma	(37)2 AT	(55)2 importance
(2)14 and	(20)4 group	(38)2 N/L	(56)2 index
(3)12 prevalence	(21)4 patient	(39)2 PbB	(57)2 inter-specific
(4)10 levels	(22)4 rate	(40)2 accuracy	(58)2 internal
(5)9 level	(23)4 shear	(41)2 age	(59)2 job
(6)9 school	(24)3 blood	(42)2 alcohol	(60)2 mass
(7)8 null	(25)3 concentration	(43)2 areas	(61)2 population
(8)7 proportion	(26)3 density	(44)2 birth	(62)2 positive
(9)6 in	(27)3 dose	(45)2 caries	(63)2 production
(10)6 lipoprotein	(28)3 efficiency	(46)2 chemotherapy	(64)2 profile
(11)6 liquid	(29)3 frequency	(47)2 correlation	(65)2 relative
(12)6 mortality	(30)3 genetic	(48)2 dental	(66)2 reliability
(13)5 as	(31)3 groups	(49)2 diet	(67)2 resistance
(14)5 autism	(32)3 incidence	(50)2 exposure	(68)2 risks'
(15)5 degree	(33)3 patients	(51)2 expression	(69)2 specificity,
(16)4 concentrations	(34)3 rates	(52)2 frequencies	(70)2 technologies
(17)4 doses	(35)3 ulnar	(53)2 heart	(71)2 tumours
(18)4 for	(36)2 ASD	(54)2 hydrostatic	(72)2 variability

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--- WordNet output for high --- =>1.高いところにある, 高い, 高さが〜の, 高貴な, 高く, 高額の, 興奮状態の, 2.高い所, 高水準 Overview of noun high The noun high has 7 senses (first 1 from tagged texts) 1. (5) high -- (a lofty level or position or degree; "summer temperatures reached an all-time high") 2. high -- (an air mass of higher than normal pressure; "the east coast benefits from a Bermuda high") 3. high -- (a state of sustained elation; "I'm on a permanent high these days") 4. high -- (a state of altered consciousness induced by alcohol or narcotics; "they took drugs to get a high on") 5. high, heights -- (a high place; "they stood on high and observed the countryside"; "he doesn't like heights") 6. senior high school, senior high, high, highschool, high school -- (a public secondary school usually including grades 9 through 12; "he goes to the neighborhood highschool") 7. high gear, high -- (a forward gear with a gear ratio that gives the greatest vehicle velocity for a given engine speed) Overview of adj high The adj high has 7 senses (first 5 from tagged texts) 1. (134) high -- (greater than normal in degree or intensity or amount; "a high temperature"; "a high price"; "the high point of his career"; "high risks"; "has high hopes"; "the river is high"; "he has a high opinion of himself") 2. (51) high -- ((literal meaning) being at or having a relatively great or specific elevation or upward extension (sometimes used in combinations like `knee-high'); "a high mountain"; "high ceilings"; "high buildings"; "a high forehead"; "a high incline"; "a foot high") 3. (10) eminent, high -- (standing above others in quality or position; "people in high places"; "the high priest"; "eminent members of the community") 4. (7) high, high-pitched -- (used of sounds and voices; high in pitch or frequency) 5. (2) high, in high spirits -- (happy and excited and energetic) 6. gamey, gamy, high -- ((used of the smell of meat) smelling spoiled or tainted) 7. high, mellow -- (slightly and pleasantly intoxicated from alcohol or a drug (especially marijuana)) Overview of adv high The adv high has 4 senses (first 2 from tagged texts) 1. (9) high, high up -- (at a great altitude; "he climbed high on the ladder") 2. (2) high -- (in or to a high position, amount, or degree; "prices have gone up far too high") 3. high, richly, luxuriously -- (in a rich manner; "he lives high") 4. high -- (far up toward the source; "he lives high up the river") --- WordNet end ---