condition mean min max ZT0-3 0.330261 0.330261 0.330261 ZT4-7 0.39904949999999995 0.39904949999999995 0.39904949999999995 ZT8-11 0.47974649999999996 0.47974649999999996 0.47974649999999996 ZT12-15 0.647993 0.647993 0.647993 ZT16-19 0.9016445 0.9016445 0.9016445 ZT20-23 0.5192595 0.5192595 0.5192595