condition mean min max ZT0-3 6.1208468375 4.742829235 7.49886444 ZT4-7 6.41694609225 5.8484292415 6.985462943 ZT8-11 3.6046388240000002 3.0949009375000003 4.1143767105 ZT12-15 0.619466252 0.263356125 0.975576379 ZT16-19 0.180734458 0.170617604 0.190851312 ZT20-23 0.11367200725000001 0.1011189885 0.12622502600000002