condition mean min max ZT0-3 1419.250883 1419.250883 1419.250883 ZT4-7 1582.6899625 1582.6899625 1582.6899625 ZT8-11 1295.7781015 1295.7781015 1295.7781015 ZT12-15 1381.9161920000001 1381.9161920000001 1381.9161920000001 ZT16-19 1339.340798 1339.340798 1339.340798 ZT20-23 1526.5996515000002 1526.5996515000002 1526.5996515000002