Sixth-grade students in intervention schools were more likely than those in control schools to receive tetanus-diphtheria-acellular pertussis ( risk ratio -LSB- RR -RSB- , @ ; @ % confidence interval -LSB- CI -RSB- , @ , @ ) , meningococcal conjugate ( RR , @ ; CI , @ , @ ) , and human papillomavirus ( for females only , RR , @ ; CI , @ , @ ) vaccines during the @-@ school year , with similar results for seventh - to eighth-grade students .