PTBP1 and gastroesophageal reflux disease: In terms of max SHAP values for PTB1, PTB2, PTB3 and PTB4 in Table 4, these associations were positive, e.g., low socioeconomic status (0.29), age (0.21), GERD (0.27) and TMD (0.23) for PTB4 in Table 4.