Donald Trump speaks at a fourth-grade level, the lowest of last 15 U.S. presidents, according to analysis

President Donald Trump connects with the American people by using a language that even a fourth grader could understand, according to a recently published analysis by Factbase on the speech patterns of the last 15 U.S. presidents.

The analysis looked at the first 30,000 words each president spoke in office and ranked each of the presidents' speech -- going back to Herbert Hoover -- using the Flesch-Kincaid grade level scale and several other tests that commonly analyze English-language difficulty levels.

Factbase

Among those at the top of the list were Hoover and Jimmy Carter, who the research suggested spoke at an 11th grade level of communicating with the public. Former President Barack Obama made third place scoring a high ninth-grade level and Trump was found to have the worst ranking since Harry Truman in 1945 by scoring at a fourth-grade level.

The 45th president's vocabulary was assessed by data gleaned from his tweets and spoken word with recent examples where the president described himself to be "like, really smart," which has been typical of the president's colloquial style that he has built a reputation for.

RELATED: Top 25 words that come to mind for Trump: Quinnipiac poll

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Top 25 words that come to mind for Trump: Quinnipiac poll
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Top 25 words that come to mind for Trump: Quinnipiac poll

"Bigot" -- 8

(Photo by Chip Somodevilla/Getty Images)

"American" -- 8

(Photo by Scott Olson/Getty Images)

"Racist" -- 9

(Photo credit MANDEL NGAN/AFP/Getty Images)

"Dishonest" -- 9

(Photo by Chris Kleponis-Pool/Getty Images)

"Clown" -- 9

(Photo by Win McNamee/Getty Images)

"Great" -- 10

(Photo by Chip Somodevilla/Getty Images)

"Disgusting" -- 10

(Photo by Chip Somodevilla/Getty Images)

"Successful" -- 11

(Photo by Jim Lo Scalzo - Pool/Getty Images)

"Narcissist" -- 11

(Photo by Michael Reynolds-Pool/Getty Images)

"Business" -- 11

(Photo credit NICHOLAS KAMM/AFP/Getty Images)

"Bully" -- 11

(Photo by Mario Tama/Getty Images)

"Trying" -- 12

(Photo by Tom Pennington/Getty Images)

"Arrogant" -- 12

(Photo by Ralph Freso/Getty Images)

"Stupid" -- 13

(Photo by: Adam Jeffery/CNBC/NBCU Photo Bank via Getty Images)

"A--hole" -- 13

(Photo by Win McNamee/Getty Images)

"Egotistical" -- 15

(Photo by Ethan Miller/Getty Images)

"Ignorant" -- 16

(Photo by Jim Lo Scalzo - Pool/Getty Images)

"Businessman" -- 18

(Photo by Mark Wilson/Getty Images)

"Strong" -- 21

(Photo by Chip Somodevilla/Getty Images)

"President" -- 22

(Photo by Alex Wong/Getty Images)

"Unqualified" -- 25

(Photo by Drew Angerer/Getty Images)

"Leader" -- 25

(Photo by Chip Somodevilla/Getty Images)

"Liar" -- 30

(Photo by Chip Somodevilla/Getty Images)

"Incompetent" -- 31

(Photo by Win McNamee/Getty Images)

"Idiot" -- 39

(Photo by Joe Raedle/Getty Images)

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However, despite Factbase's various calculations used in its assessment of each of the 15 president's speaking levels, the results were the same in every test with Trump always receiving the lowest ranking.

According to the power researcher, Trump has used fewer "unique words" than any president as well as the fewest average syllables, which Obama was apparently most fluent in using.

SEE ALSO: Donald Trump's grammar skills in speeches equated to those of a 6th grader

"By every metric and methodology tested, Donald Trump's vocabulary and grammatical structure is significantly more simple, and less diverse, than any President since Herbert Hoover, when measuring 'off-script' words, that is, words far less likely to have been written in advance for the speaker," Factbase CEO Bill Frischling wrote. 

"The gap between Trump and the next closest president ... is larger than any other gap using Flesch-Kincaid. Statistically speaking, there is a significant gap."

Trump's results in the recent analysis appear to be a step below findings obtained in March 2016 from a team at Carnegie Mellon University that analyzed the speeches of many 2016 presidential candidates and equated Trump's grammar skills to those of a 6th grader. 

RELATED: People who might run against Trump in 2020

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People who might run against Trump in 2020
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People who might run against Trump in 2020

Former Vice President Joe Biden

(Photo by Patrick T. Fallon/Bloomberg via Getty Images)

Sen. Bernie Sanders (I-Vt.)

(Photo by Scott Eisen/Getty Images)

Sen. Elizabeth Warren (D-Mass.)

(Photo by Craig F. Walker/The Boston Globe via Getty Images)

Sen. Kamala Davis (D-Calif.)

(Photo By Bill Clark/CQ Roll Call)

Sen. Chris Murphy (D-Conn.)

(Photo by Zach Gibson/Getty Images)

Sen. Amy Klobuchar (D-Minn.)

(Photo by Drew Angerer/Getty Images)

Facebook CEO and founder Mark Zuckerberg

(Photo by David Paul Morris/Bloomberg via Getty Images)

Sen. Cory Booker (D-N.J.)

(Photo by Jason LaVeris/FilmMagic)

Former U.S. Secretary of State John Kerry (D)

(Photo by: REUTERS/Gonzalo Fuentes)

Sen. Kirsten Gillibrand (D-N.Y.)

(Photo by: Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images)

Colorado Gov. John Hickenlooper

(Photo By Bill Clark/CQ Roll Call)

New York Gov. Andrew Cuomo

(Photo credit MENAHEM KAHANA/AFP/Getty Images)

Former Maryland Gov. Martin O'Malley

(Photo credit NICHOLAS KAMM/AFP/Getty Images)

Former Housing and Urban Development Secretary Julian Castro

(Photo by Pete Marovich/Bloomberg via Getty Images)

Sen. Tim Kaine (D-Va.)

(Photo by Daniel Acker/Bloomberg via Getty Images)

Sen. Al Franken (D-Minn.)

(Photo by Zach Gibson/Getty Images)

Sen. Sherrod Brown (D-Ohio)

(Photo credit ZACH GIBSON/AFP/Getty Images)

Former Massachusetts Gov. Deval Patrick

(Photo by Suzanne Kreiter/The Boston Globe via Getty Images)

New York City Mayor Bill de Blasio

(Photo by James Keivom/NY Daily News via Getty Images)

Dallas Mavericks owner Mark Cuban

(Photo by Andrew Harrer/Bloomberg via Getty Images)

Environmental activist Tom Steyer

(Photo by David Paul Morris/Bloomberg via Getty Images)

Democratic National Committee Chairman Tom Perez

(Photo by Taylor Hill/FilmMagic)

Minnesota Gov. Mark Dayton 

(Photo by Stephen Maturen/Getty Images)

Virginia Gov. Terry McAuliffe

(Photo by Drew Angerer/Getty Images)

California Lt. Gov. Gavin Newsom

(Photo by Yichuan Cao/NurPhoto via Getty Images)

Facebook COO Sheryl Sandberg

(Photo credit FABRICE COFFRINI/AFP/Getty Images)

Former first lady Michelle Obama

(Photo by Gerardo Mora/Getty Images)

Starbucks CEO Howard Schultz

(Photo credit should read JASON REDMOND/AFP/Getty Images)

Dwayne "The Rock" Johnson

(Photo by Donna Ward/Getty Images)

Rep. Tulsi Gabbard (D-Hawaii)

(Photo credit TIMOTHY A. CLARY/AFP/Getty Images)

Rep. Keith Ellison (D-Minn.)

(Photo by Alex Wong/Getty Images)

Rep. Sean Patrick Maloney (D-N.Y)

(Photo By Tom Williams/CQ Roll Call)

California Gov. Jerry Brown

(Photo by Tiffany Rose/Getty Images for Caruso )

Media mogul Oprah Winfrey

(Photo by Moeletsi Mabe/Sunday Times/Gallo Images/Getty Images)

Former Sen. Russ Feingold (D-Wis.)

(Photo By Tom Williams/CQ Roll Call)

Former Vermont Gov. Howard Dean

(Marcus Yam / Los Angeles Times)

Former Vice President Al Gore

(Photo credit DAVID MCNEW/AFP/Getty Images)

Sen. Mark Warner (D-Va.)

(Photo by Katherine Frey/The Washington Post via Getty Images)

Former Sen. Jim Webb (D-Va.)

(Photo by Andrew Harrer/Bloomberg via Getty Images)

Los Angeles Mayor Eric Garcetti

(Photo by Rodin Eckenroth/Getty Images,)

Rep. Seth Moulton (D-Mass.)

(Photo by Craig F. Walker/The Boston Globe via Getty Images)

New Orleans Mayor Mitch Landrieu

Albin Lohr-Jones/Pool via Bloomberg

Sen. Tammy Duckworth (D-Ill.)

(Photo by Scott Olson/Getty Images)

Washington Gov. Jay Inslee

(Photo by Karen Ducey/Getty Images)

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