condition mean min max ZT0-3 13.354075000000002 13.164200000000001 13.54395 ZT4-7 10.65273 10.65273 10.65273 ZT8-11 15.10855 15.10855 15.10855 ZT12-15 0 0 0 ZT16-19 14.9672 14.9672 14.9672 ZT20-23 16.3121 16.3121 16.3121