Table 2.

Quality assessment of included studies.

Study ID	Randomization	Blinding of participants and personnel	Allocation concealment	Blinded outcome assessment	Incomplete outcome data	Selective reporting
Bharani et al., 2002 [14]	✓	✓	NS	NS	NS	NS
Kumar et al., 1999 [13]	✓	NS	NS	NS	NS	NS
Dwivedi and Jauhari, 1997 [15]	✓	NS	NS	NS	NS	NS
Dwivedi and Agarwal, 1994 [16]	NS	NS	NS	NS	NS	NS
Jain et al., 1992 [17]	NS	NS	NS	NS	NS	NS

NS: not specified.