Figure Legends
Fig. 1. PRISMA flow diagram of the identification and selection of trials; CNKI; VIP, Very Important Paper.
Fig. 2. Results of the meta-analysis of intubation rates; NHFOV, noninvasive high-frequency oscillatory ventilation; NIPPV, nasal intermittent positive-pressure ventilation
Fig. 3a. Results of the meta-analysis of reintubation rates; NHFOV, noninvasive high-frequency oscillatory ventilation; NIPPV, nasal intermittent positive-pressure ventilation
Fig. 3b. Results of the meta-analysis of reintubation rates within 72 h; NHFOV, noninvasive high-frequency oscillatory ventilation; NIPPV, nasal intermittent positive-pressure ventilation
eFig.1 (Supplementary Material)Risk of bias summary
eFig.2 (Supplementary Material)Risk of bias graph
eFig.3 (Supplementary Material)Results of the meta-analysis of reintubation rates within 7 days; NHFOV, noninvasive high-frequency oscillatory ventilation; NIPPV, nasal intermittent positive-pressure
eFig. 4 (Supplementary Material)Results of the meta-analysis of duration of non-invasive ventilation
eFig. 5 (Supplementary Material)Results of the meta-analysis of total oxygen therapy time
eFig.6 (Supplementary Material)Results of the meta-analysis of LOS
eFig.7a (Supplementary Material)Funnel plot of abdominal distention
eFig.7b (Supplementary Material)Funnel plot of NEC
eFig.7c (Supplementary Material)Funnel plot of nasal injury
eFig.7d (Supplementary Material)Funnel plot of BPD
eFig.7e (Supplementary Material)Funnel plot of duration of noninvasive ventilation
eFig.7f (Supplementary Material)Funnel plot of total oxygen therapy time