Table 1 A summary of searched literatures and national polices and laws

22

You

1992

All the children up to 7 years old

Rugao City, Jiangsu Province

A newborn baby had to pay for a lump-sum immunization insurance for 7 years (18–25 Yuan), right after the baby was discharged from maternal and children hospitals. The lump-sum immunization insurance up to 7 years was a barrier for migrant children to receive immunizations.

23

Xu et al.

1995

6121 migrant children less than one year old

Linyi City, Shandong Province

A shorter period of immunization insurance (only one year after the delivery instead of 7 years) used for migrant population with much lower premium and it was very effective for migrant children to receive 5 basic vaccines in the first year.

24

Li et al.

2008

2859 migrant children aged 0–7

Baicheng City, Jilin Province

The rate of appropriate immunizations for migrant children increased from 80% in 2004 to 95% in 2006, after this national policy "Regulation about Vaccine and Immunization Management" was implemented in 2005

25

Liao

2008

1859 migrant families

Chengdu City, Sichuan Province

A positive relationship between immunization certificates and age-appropriate immunization rates was found. 95% of migrant children in Chengdu City, Sichuan Province had immunization certificates and their age-appropriate immunization rates were more than 90%.

26

Gao

2008

120 migrant children

Yangzhou City, Jiangsu Province

A positive relationship between immunization certificates and age-appropriate immunization rates was found. 95.8% of migrant children had immunization certificates in Yangzhou City, Jiangsu Province, and their 5 vaccine’immunizations rates were 87.5%

27

Yin et al.

2008

436 migrant children

Panzhihua City, Sichuang Province

A positive relationship between immunization certificates and age-appropriate immunization rates was found. 97.71% of migrant children in Panzhihua City, Sichuan Province had immunization certificates and 5 vaccines (except hepatitis B) were more than 85%

28

Nakano et al.

1997

91 children

Myanmar border, Yunan Province

The former family planning policy had been believed to be one of most important reasons for the low immunization rates for migrant children

29

Li et al.

1994

194 migrant children

Wujiang City, Jiangsu Province

Migrant families had more children violating the family planning policy. 13.92% of 194 migrant children were out of family planning policies in Wujiang City, Jiangsu Province in 1993.

30

Wang

1996

61 polio cases

Wuhua County, Guangdong Province

Investigated 61 polio outbreak cases in Wuhua County, Guangdong Province in 1993, and found that 39 cases were for children violating the family planning policy or migrant children and none of them had a complete polio immunization history

31

Han et al.

2014

1610 migrant children

Guangdong Province

Migrant children living in a poor family had a low up-to-date immunization rates.

32

Zhang and Wang

1999

All migrant children

Jiangle County, Fujiang Province

Examined immunization for special population in Jiangle County, Fujian Province, and found this policy "Management Plan for Special Population’s Expanded Program for Immunization" was very effective to improve immunization for migrant children.

33

National People's Congress

1989

Entire population

China

People’s Republic of China’s Law about Preventing and Controlling Communicable Diseases (national law)

34

National People's Congress

2004

Entire population

China

Revision of People’s Republic of China’s Law about Preventing and Controlling Communicable Diseases (national law)

35

State Council

2005

Entire population

China

Regulation about Vaccine and Immunization Management (national policy)

36

Ministry of Health

1998

Entire population

China

Management Plan for Special Population’s Expanded Program for Immunization (national policy)