condition mean min max ZT0-3 0.6947098333333334 0.3614085 0.926901 ZT4-7 0.3799465 0.3799465 0.3799465 ZT8-11 2.333044 2.333044 2.333044 ZT12-15 4.0181225000000005 3.84619 4.190055 ZT16-19 2.113375 2.113375 2.113375 ZT20-23 0.8442320000000001 0.8442320000000001 0.8442320000000001