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Table 8 Fetal heart rate (male), beats per minute

From: Sex differences in umbilical artery Doppler indices: a longitudinal study

Gestation (week)

2.5th percentile

5th percentile

10th percentile

25th percentile

Mean

75th percentile

90th percentile

95th percentile

97.5th percentile

20

129

132

135

141

147

153

159

162

165

21

128

131

134

140

146

152

157

161

164

22

127

130

133

139

145

151

156

160

163

23

127

129

133

138

144

150

156

159

162

24

126

129

132

137

143

149

155

158

161

25

125

128

131

136

142

149

154

158

160

26

124

127

130

136

142

148

154

157

160

27

123

126

130

135

141

147

153

156

159

28

123

126

129

134

141

147

153

156

159

29

122

125

128

134

140

146

152

156

159

30

121

124

128

133

140

146

152

155

158

31

121

124

127

133

139

146

152

155

158

32

120

123

127

132

139

145

151

155

158

33

120

123

126

132

138

145

151

155

158

34

119

122

125

131

138

145

151

154

158

35

118

121

125

131

138

144

151

154

157

36

118

121

125

131

137

144

150

154

157

37

117

120

124

130

137

144

150

154

157

38

117

120

124

130

137

144

150

154

157

39

116

120

123

129

136

143

150

154

157

40

116

119

123

129

136

143

150

154

157

  1. Sex-specific reference values of the fetal heart rate (HR) for the 2.5th, 5th, 10th, 25th, 50th, 75th, 90th, 95th, and 97.5th percentiles during the second half of pregnancy (male fetuses)