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Table 5 Changes of awareness and attitudes 1 year after the intervention among the interventional group

From: Effect of an educational intervention on HPV knowledge and attitudes towards HPV and its vaccines among junior middle school students in Chengdu, China

Items Immediately after the intervention Follow-up after 1 year Change P a
n (%) n (%) Percentage point difference (%)
Cause for cervical cancer
Infected by HPV 534 (58.3) 298 (36.0) −22.3 < 0.001
Other answersd 382 (41.7) 530 (64.0)  
Total 916b 828c  
The transmitted route of HPV
Sexual transmission 787 (86.9) 518 (63.8) −23.1 < 0.001
Other answerse 119 (13.1) 294 (36.2)  
Total 906b 812c  
The most effective method to prevent HPV infection
HPV vaccination 790 (86.1) 586 (71.4) −14.7 < 0.001
Other answersf 122 (13.3) 235 (28.6)  
Total 912b 821c  
The best time stage to HPV vaccination s
Junior middle school 778 (84.9) 305 (36.9) −48.0 < 0.001
Other answers 138 (15.1) 522 (63.1)  
Total 916b 827c  
Are you willing to vaccinate yourself?
Yes 808 (88.4) 647 (78.8) −9.6 < 0.001
No 106 (11.6) 174 (21.2)  
Total 914b 821c  
  1. a Chi-squared test
  2. bNumbers are not equal to 918 due to some incomplete answers
  3. cNumbers are not equal to 830 due to some incomplete answers
  4. dincluding: heredity, sexually transmitted disease, multiple sexual partners, bacterial infection, bad health habits, smoking and other unhealthy lifestyle, no answer
  5. eincluding: airborne transmission, food-borne transmission, all of the three routes
  6. fregular condom use, sexual onset at early age, avoiding multiple sexual partners, no answer