Table 3. Time-dependent deterioration in percentage of participants achieving adequate compression depth by sex.

Sex	Time period	% Adequate compression depth		P-value
		Walking CPR	Straddling CPR
Male	total 2 minutes	93.9 [76.0–99.3]	100 [99.4–100]	0.006
	1st period (0–30 sec.)	100 [82.5–100] *	100 [99.6–100] **	0.42
	2nd period (30–60 sec.)	100 [88.6–100] †	100 [100–100] ††	0.17
	3rd period (60–90 sec.)	88.2 [64.6–100] ‡	100 [100–100] ‡‡	0.006
	4th period (90–120 sec.)	88.3 [72.4–97.5] §	100 [99.6–100] §§	0.002
Female	total 2 minutes	30.8 [8.8–43.5]	99.3 [92.4–100]	<0.001
	1st period (0–30 sec.)	82.8 [25–89.9] *	100 [98.3–100] **	<0.001
	2nd period (30–60 sec.)	32.4 [1.4–64.3] †	100 [95.5–100] ††	<0.001
	3rd period (60–90 sec.)	1.8 [0–15.7] ‡	100 [83.5–100] ‡‡	<0.001
	4th period (90–120 sec.)	1.8 [0–6.5] §	100 [87.6–100] §§	<0.001

% adequate compression depth: no. of adequate compressions depth/no. of total compressions

The definition of the adequate depth is ≥40 mm, according to the 2015 Resuscitation Council of Asia guidelines.

Walking CPR group vs straddling CPR group: Wilcoxon/Kruskal-Wallis tests (rank sums)

Comparison between inter-30’s section: Steel-Dwass test

Medians [interquartile range (IQR), Q₁: lower quartile (25th percentile)—Q₃: upper quartile (75th percentile)]

Men: * vs †: p = 1.00, † vs ‡: p = 0.49, ‡ vs §: p = 0.10, * vs ‡: p = 0.65, † vs §: p = 0.32, * vs §: p = 0.48, ** vs ††: p = 0.97, †† vs ‡‡: p = 1.00, ‡‡ vs §§: p = 1.00, ** vs ‡‡: p = 0.095, †† vs §§: p = 1.00, ** vs §§: p = 0.92

Women: * vs †: p = .032, † vs ‡: p = 0.35, ‡ vs §: p = 0.98, * vs ‡: p = 0.007, † vs §: p = 0.18, * vs §: p = 0.008, ** vs ††: p = 0.96, †† vs ‡‡: p = 1.00, ‡‡ vs §§: p = 1.00, ** vs ‡‡: p = 0.100, †† vs §§: p = 1.00, ** vs §§: p = 0.93