condition mean min max ZT0-3 10.881232 10.881232 10.881232 ZT4-7 10.433916499999999 10.433916499999999 10.433916499999999 ZT8-11 10.2428745 10.2428745 10.2428745 ZT12-15 10.947865 10.947865 10.947865 ZT16-19 10.133806 10.133806 10.133806 ZT20-23 15.0934335 15.0934335 15.0934335