condition mean min max ZT0-3 42.808944 42.808944 42.808944 ZT4-7 48.4291355 48.4291355 48.4291355 ZT8-11 43.61822 43.61822 43.61822 ZT12-15 36.625420500000004 36.625420500000004 36.625420500000004 ZT16-19 35.137491 35.137491 35.137491 ZT20-23 41.1281415 41.1281415 41.1281415