condition mean min max ZT0-3 331.1 331.1 331.1 ZT4-7 289.7 289.7 289.7 ZT8-11 240.3 240.3 240.3 ZT12-15 263.45 263.45 263.45 ZT16-19 315.70000000000005 315.70000000000005 315.70000000000005 ZT20-23 296.4 296.4 296.4