A reviewer describes how he reads a manuscript: title, abstract, then straight to the tables and figures before the methods. If a table makes him flip back to find out what “Group 2” is or what “MSS” stands for, his first impression of the paper has already slipped. Plenty of editors and busy readers do exactly the same.
Tables and figures are the most-read part of a paper after the abstract. One principle covers both: they must stand alone. A reader looking only at the table and its title or caption should understand what it shows, what was measured, in whom, and in what units.
When you need a table
Tables suit situations where readers need exact values for many variables or groups. If you have two or three numbers, put them in a sentence. If the message is a trend or pattern, use a figure. A common thesis habit is one frequency table per survey item, producing thirty tiny tables. Combine items that share a response scale into one table: one row per item, response options as columns.
Anatomy of a good table
- Number and title above the table: “Table 2. Participant characteristics by mode of study (n = 412)”. The title says what the table contains, not what it proves.
- Column headings that are short, with units in brackets: “Age (years)”, “Self-study (hours/week)”.
- Body with numbers aligned on the decimal point.
- Notes beneath: abbreviations, significance markers, and the data source if it is not your own.
The three-rule layout (a horizontal line above the column headings, one below them and one at the foot, with no vertical lines) is the convention in APA and many other styles. Vertical lines and shaded cells add clutter without aiding reading. To group columns, use a short horizontal rule above the grouped headings.
Order rows and columns for the comparison you want
People compare numbers down a column more easily than across a row. So put the things you want compared in the same column. If the main message is how online and face-to-face groups differ across several variables, make each variable a row and put the two groups in adjacent columns.
| Do | Avoid |
|---|---|
| Order rows meaningfully: by size, or by the order of your framework | The order variables happen to appear in your data file |
| Consistent decimal places within a column | 2.1 sitting next to 2.137 |
| n in the column heading or the title | Leaving readers to guess the sample size |
| A dash for cells that do not apply, explained in a note | Blank cells with no explanation |
| Plain-language variable names: “Satisfaction with tutor” | Software names such as “Q14_sat_tut” |
Abbreviations, symbols and notes
Every abbreviation in a table must be defined in that table’s note, even if it is defined in the text. A common order for notes is general notes (abbreviations, source), then specific notes for individual cells marked with superscript letters, then probability notes. Many journals now prefer confidence intervals and exact p values over asterisks; check the author guidelines.
Regression tables
Regression tables are often overloaded. At minimum you need variable names, coefficients, confidence intervals (or standard errors) and p values if the journal wants them. State the outcome variable in the title, the model type, the reference category for categorical predictors, and model statistics (n, R² or fit indices) at the foot. Never paste the full software output.
Figure captions: three parts
A caption sits below the figure and should include:
- A title sentence saying what the figure shows: “Figure 3. Final exam score by weekly self-study hours, split by mode of study.”
- How to read it: what each point and line represents and what the error bars show (standard deviation, standard error or 95% confidence interval). Without this, readers cannot judge the figure.
- Essential details: sample size, data source, abbreviations.
Fields disagree on whether a caption should state the finding or stay descriptive. Some natural science journals like the first sentence to state the result; many social science journals prefer a neutral description. Look at recent papers in your target journal and follow suit.
Technical details people overlook
- Axis labels with variable name and unit, in a font still legible when the figure shrinks to one column width.
- Bar chart axes that start at zero; truncating them makes small differences look huge.
- Colour that survives greyscale printing and colour-vision deficiency; pair colours with marker shapes or line types.
- Legends placed inside empty plot space, or direct labels on lines, rather than forcing eyes back and forth.
- Resolution and format as the journal specifies, usually vector formats for charts.
- Multi-panel figures labelled A, B, C, with the caption explaining each panel.
Checklist for every table and figure
- Cited in the text in numerical order.
- Title or caption says what, in whom and when.
- Units and n are shown.
- Every abbreviation is defined in the table or caption.
- Numbers match those in the text.
- No duplication of information shown in another table or figure.
A quick test: give one table and its title to a colleague in your field who has not read the paper and ask what it shows. Any question they need to ask points to exactly what the title or notes are missing.
Câu hỏi thường gặp
Does a table title go above or below the table?
In APA and many other styles, the table number and title go above the table, while figure captions go below the figure. Always check your journal’s author guidelines, as some differ.
What is a three-line table?
It is a table with only three horizontal rules: above the column headings, below them and at the bottom, with no vertical lines. It is clean and widely used in journals.
What should a figure caption include?
A sentence stating what the figure shows, an explanation of how to read elements such as error bars or trend lines, and details such as sample size, data source and abbreviations. Readers should understand the figure without searching the text.
Do I need to define abbreviations again in a table?
Yes. Define every abbreviation in the table note, because many readers look at tables without reading the surrounding text.
How can I reduce the number of tables in my dissertation?
Combine items that share a response scale into one table, with one row per item and response options as columns. Low-information tables can move to an appendix or become a sentence.
