condition mean min max ZT0-3 12.685265 12.685265 12.685265 ZT4-7 15.4153005 15.4153005 15.4153005 ZT8-11 15.8110745 15.8110745 15.8110745 ZT12-15 15.144311 15.144311 15.144311 ZT16-19 12.351274 12.351274 12.351274 ZT20-23 11.631419000000001 11.631419000000001 11.631419000000001