Table 2.

Search strategy used in Medline database

Database: Ovid Medline (R) 1946 to March 2017
SN	Search strategy	Results
1	Only Child/or Child/or child.mp. or Child, Preschool/	1 767 004
2	Infant/or infant.mp.	1 030 660
3	Kid.mp.	1251
4	Toddler.mp.	2240
5	1 or 2 or 3 or 4	2 242 988
6	Screen time.mp.	639
7	Smartphones.mp. or Cell Phones/	5961
8	Mobile phones.mp.	1627
9	Handheld computers.mp. or Computers, Handheld/	2721
10	Smartboard.mp.	2
11	PDA.mp.	5860
12	Screen media.mp.	42
13	Mobile screen.mp.	5
14	Microcomputers/or Computers, Handheld/or electronic tablets.mp.	16 724
15	Tablets/or Tablets.mp.	34 967
16	Mobile Applications/or iPads.mp.	699
17	Handheld media.mp.	1
18	Touchscreens.mp.	22
19	Mobile devices.mp.	552
20	Digital technology.mp.	348
21	6 or 7 or 8 or 9 or 10 or 11 or 12 or 13 or 14 or 15 or 16 or 17 or 18 or 19 or 20	64 324
22	5 and 21	6648
23	(‘Screen-viewing’ or ‘screen time’ or ‘mobile use’ or ‘use of smartphones’ or ‘Cell phone use’ or ‘increased screen time’ or ‘use of electronic tablets’ or ‘use of mobile screens’).mp.	965
24	5 and 21 and 23	525
25	Limit 24 to (English language and humans and yr=‘2009 -Current’ and ‘all child (0 to 18 years)’)	482

mp: title, abstract, original title, name of substance word, subject heading word, keyword heading word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier.

*Sign denotes for any character(s).

SN, serial number.