| Included study | Nation | Year | Age of children | Sample of size | Interventions | Outcome index | ||
| Control | Experiment | Control | Experiment | |||||
| Afsansh et al. [7] | Iran | 2017 | 2 - 11 | 48 | 48 | No family company with routine preoperative nursing care | Propaganda plus on the day before operation + PPIA | a (T0 - T2) |
| Kristen et al. [17] | Canada | 2015 | 2 - 10 | 44 | 49 | No family company with routine preoperative nursing care | Propaganda on the day before operation + PPIA | b (T1 - T3) d e (T3) c |
| Zeev et al. [8] | United States | 2007 | 2 - 10 | 99 | 94 | No family company with routine preoperative nursing care | Propaganda plus on the day before operation + PPIA | a (T1 - T2) e (T1 - T3) |
| Arai et al. [18] | Japan | 2007 | 1 - 3 | 19 | 19 | No family company with routine preoperative nursing care | Propaganda on the day before operation + PPIA | e (T3) |
| Kristi et al. [16] | Canada | 2010 | 3 - 6 | 30 | 31 | No family company with routine preoperative nursing care | Propaganda on the day before operation + PPIA | a (T2 - T3) |
| Li [9] | Hong Kong, China | 2007 | 7 - 12 | 106 | 97 | No family company with routine preoperative nursing care | Propaganda 1 - 2 weeks before operation + PPIA | a (T1 - T3) b (T1 - T3) d |
| Farid et al. [10] | Iran | 2011 | 2 - 7 | 40 | 41 | No family company with routine preoperative nursing care | Propaganda on the day before operation + PPIA | e |
| Spaffor et al. [21] | Canada | 2002 | 5 - 12 | 30 | 30 | No family company with routine preoperative nursing care | Propaganda one week before operation + PPIA | c |
| Kain et al. [11] | United States | 1998 | 2 - 8 | 29 | 26 | No family company with routine preoperative nursing care | Propaganda three days before operation + PPIA | a, d (T1 - T3) |
| Zeev et al. [20] | United States | 1996 | 1 - 6 | 41 | 41 | No family company with routine preoperative nursing care | Propaganda one week before operation + PPIA | a, b (T1 - T2) |
| W. J. Huang et al. [19] | China | 2017 | 6 - 11 | 48 | 48 | No family company with routine preoperative nursing care | Propaganda on the day before operation + FCC | a (T0 - T1) b (T0 - T1) d c |
| L. F. Wang et al. [12] | China | 2017 | 1 - 12 | 34 | 34 | No family company with routine preoperative nursing care | Propaganda one week before operation + PPIA | a (T1 - T2) |
| J. F. Lou et al. [13] | China | 2013 | 3 - 5 | 20 | 20 | No family company with routine preoperative nursing care | Propaganda before operation + PPIA + Games | a (T0 - T3) d (T0 - T3) e (T3) c |
| G. Y. Zhang et al. [14] | China | 2012 | 3 - 11 | 52 | 52 | No family company with routine preoperative nursing care | Propaganda on the day before operation + PPIA | a (T1 - T4) d e c |
| Q.Xu [15] | China | 2011 | 2 - 12 | 60 | 60 | No family company with routine preoperative nursing care | Propaganda on the day before operation + PPIA | a |