Fig. 4
The graph shows the main results of the comparison. In this study, the comparison project was broken up into four parts:① J1 vs. J2 vs. J3, ②J1-2 vs. J2-2 vs. (J1-1 + J2-1 + J3), ③J1-1 vs. J2-1 vs. J3, ④(J1-1 + J2-1) vs. (J1-2 + J2-2). To visualize the significance of comparison results, the P value was transformed as minus lg P (the vertical axis of the graph) and displayed as bars with different colors representing different comparison parts: blue for part 1, orange for part 2, gray for part 3 and yellow for part 4 (details can be seen in Fig. 3). The horizontal axis lists compared items of migraine and migraine-related factors, which were divided into migraine features (enclosed by blue dotted line), migraine related factors (enclosed by red dotted line) and others (enclosed by green dotted line). P < 0.05 was defined as statistically significant. The minus Ig 0.05 was 1.3 (shown by the black arrowhead and dotted line). Every bar in the graph reflects the most or highest group of the comparison except consumption of coffee (reflecting the least), and the names of the group with P < 0.05 are labelled on the top of the graph