condition mean min max ZT0-3 295.13851 295.13851 295.13851 ZT4-7 335.62139249999996 335.62139249999996 335.62139249999996 ZT8-11 214.5452335 214.5452335 214.5452335 ZT12-15 260.285466 260.285466 260.285466 ZT16-19 113.022627 113.022627 113.022627 ZT20-23 88.3212925 88.3212925 88.3212925