SAMPLE STUDY: A team of researchers interested in asthma symptoms in children wanted to know how children's symptoms were affected in dry versus humid conditions. The researchers recruited 18 paediatric asthma patients to spend four weeks under two counterbalanced conditions: sleeping with a dehumidifier for two weeks to create a "dry" environment, and sleeping with a humidifier for two weeks for a "humid" environment. After experiencing each condition, patients recorded the number of asthma symptoms they had experienced. The change in asthma symptoms from dry to humid conditions was 5, showing a reduction in the number of symptoms experienced in humid conditions compared to dry conditions.

What are the scales of measurement for each variable measured in the study?