* School district: School lunch programs differ greatly in quality and menu offerings depending on funding, local regulations, and the expertise of the food service staff. A wealthy district might have much higher satisfaction rates than a poorer one.
* Student demographics: Preferences vary by age, culture, and dietary restrictions or needs. A student with allergies or a specific diet might find school lunches less appealing.
* Survey methodology: The way a survey is conducted significantly impacts the results. A forced-choice question ("Do you like school lunch? Yes/No") will yield different results than one allowing for nuanced responses. The timing of the survey (e.g., right after a particularly good or bad lunch) can also skew the results.
While some studies exist on school lunch satisfaction, they're often localized and don't provide a reliable global percentage. You'd likely find a wide range of percentages depending on the study and its parameters. Instead of a specific number, it's safe to say that student satisfaction with school lunches is highly variable and often less than overwhelmingly positive.