Table I.

Observational studies included in meta-analysis

Author/Reference #	Year	Study Group	Control Group	N	GA	Antenatal steroid	Recent AI Exposure
Neibyl22	1986	AI*	None	135	<35 wks, Matched	No data	No data
Baerts37	1990	AI+ Fenoterol	None or Fenoterol	159	< 30 wks, Matched	No data	Yes
Gerson26	1990	AI + Mg or AI + β-mimetic	Mg or β-mimetic	57	< 34 wks, Matched	Matched	No
Norton23	1993	AI + Mg or AI + β-mimetic	None, Mg, or β-mimetic	114	< 30 wks, Matched	Matched	Yes
Major27	1994	AI + Mg	Mg ± β-mimetic	759	< 30 wks	Unmatched	Yes
Gardner29	1995	AI + Mg ± β-mimetic	None, Mg, or β-mimetic	124	< 32 wks, Matched	Matched	No
Iannucci30	1996	AI + Mg	Mg	56	< 30 wks	Unmatched	No data
al-Alaiyan28	1996	AI*	None	30	< 34 wks	Unmatched	No data
Souter31	1998	AI + Salbutamol or AI + Nifedipine	None, Salbutamol, or Nifedipine	79	< 30 wks, Matched	Matched	Yes
Pietrantoni33	1995	AI**	None	280	< 32 wks, Matched	Matched	No data
Van Overmeire41	1998	AI + β-mimetic	β-mimetic	76	< 33 wks, Matched	Unmatched	Yes
Hammerman24	1998	AI*	None	105	< 34 wks, Matched	No data	No data
Vermillion32	1999	AI + Mg	Mg	225	< 32 wks, Matched	Matched	Yes
Ojala25	2000	AI*	None	176	< 32 wks	Unmatched	No data
Parilla40	2000	AI ± Mg*	Mg or None	120	< 37 wks	Unmatched	No data
Weintraub34	2001	AI*	None	219 0	< 32 wks	Unmatched	No data
Suarez39	2001	AI ± Mg*	Mg	112	< 32 wks	Unmatched	No data
Abbasi35	2003	AI + Mg ± Terbutaline	None, Mg, or Terbutaline	248	< 34 wks, Matched	Matched	Yes
Friedman42	2005	AI	Mg or Ritodrine or Nifedipine	284	< 32 wks	Unmatched	No data
Murata38	2005	AI + Ritodrine	Ritodrine + Mg	201	< 33 wks	Unmatched	No
Doyle 36	2005	AI + Mg	Mg or none	549	< 32 wks	Unmatched	No data

GA denotes gestational age; AI denotes antenatal indomethacin; N denotes number of subjects; Mg denotes magnesium sulfate;

^*First choice tocolytic or sole agent.

^**Unclear about first choice tocolytic.