condition mean min max ZT0-3 62.903024 62.903024 62.903024 ZT4-7 69.133014 69.133014 69.133014 ZT8-11 67.995133 67.995133 67.995133 ZT12-15 59.1464705 59.1464705 59.1464705 ZT16-19 66.8176085 66.8176085 66.8176085 ZT20-23 60.759395 60.759395 60.759395