condition mean min max ZT0-3 418.578211 418.578211 418.578211 ZT4-7 453.43575150000004 453.43575150000004 453.43575150000004 ZT8-11 568.7332805 568.7332805 568.7332805 ZT12-15 443.03967550000004 443.03967550000004 443.03967550000004 ZT16-19 544.187248 544.187248 544.187248 ZT20-23 509.34410649999995 509.34410649999995 509.34410649999995