The researchers observed a significant increase over the summer in the number of different fruits and vegetables in the households of the intervention group compared with the control group. (wakehealth.edu)
The sample size was 69 women who ate 6 dates each day for 4 weeks before their estimated due date compared with a control group of 45 women who ate no dates. (anniesdorsetkitchen.com)
Yes, there can be issues with control of the classroom. (nsba.org)