condition mean min max ZT0-3 2485.3 2485.3 2485.3 ZT4-7 2004.2 2004.2 2004.2 ZT8-11 2117.0 2117.0 2117.0 ZT12-15 2320.8 2320.8 2320.8 ZT16-19 2487.9 2487.9 2487.9 ZT20-23 2664.8 2664.8 2664.8