condition mean min max ZT0-3 256.30898 256.30898 256.30898 ZT4-7 271.19456049999997 271.19456049999997 271.19456049999997 ZT8-11 376.6963025 376.6963025 376.6963025 ZT12-15 343.40292150000005 343.40292150000005 343.40292150000005 ZT16-19 390.911606 390.911606 390.911606 ZT20-23 404.7371 404.7371 404.7371