condition mean min max ZT0-3 28.54225 28.54225 28.54225 ZT4-7 18.6453 18.6453 18.6453 ZT8-11 28.40415 28.40415 28.40415 ZT12-15 26.25215 26.25215 26.25215 ZT16-19 41.67385 41.67385 41.67385 ZT20-23 32.20345 32.20345 32.20345