condition mean min max ZT0-3 0.7647465 0.7647465 0.7647465 ZT4-7 0.398362 0.398362 0.398362 ZT8-11 0.7200365 0.7200365 0.7200365 ZT12-15 1.081803 1.081803 1.081803 ZT16-19 0.8841055 0.8841055 0.8841055 ZT20-23 1.0342755000000001 1.0342755000000001 1.0342755000000001