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Table 1 Detailed definition of different sentiment categories for HPV vaccines related tweets

From: Optimization on machine learning based approaches for sentiment analysis on HPV vaccines related tweets

Sentiment Description
Positive Show positive opinion or prompt the uptake of HPV vaccine
Negative Safety Concerns or doubt on the safety issues of HPV vaccine or present vaccine injuries
Efficacy Concerns or doubt on the effectiveness of HPV vaccine
Cost Concerns on the cost of HPV vaccine (e.g.: money or time)
Resistant Resistance to HPV vaccines due to cultural or emotional issues
Others Other concerns
Neutral Related to HPV vaccine topic but contains no sentiment or sentiment is unclear or contains both negative and positive sentiment
Unrelated Not related to HPV vaccine topic