Sixth-grade students in intervention schools were more likely than those in control schools to receive tetanus-diphtheria-acellular pertussis ( risk ratio [ RR ] , 1.30 ; 95 % confidence interval [ CI ] , 1.08 , 1.57 ) , meningococcal conjugate ( RR , 1.42 ; CI , 1.18 , 1.70 ) , and human papillomavirus ( for females only , RR , 1.69 ; CI , 1.21 , 2.36 ) vaccines during the 2010-2011 school year , with similar results for seventh - to eighth-grade students .