condition mean min max ZT0-3 156.214524 156.214524 156.214524 ZT4-7 166.77666349999998 166.77666349999998 166.77666349999998 ZT8-11 199.61065050000002 199.61065050000002 199.61065050000002 ZT12-15 158.0868455 158.0868455 158.0868455 ZT16-19 162.51374750000002 162.51374750000002 162.51374750000002 ZT20-23 138.6582825 138.6582825 138.6582825