condition mean min max ZT0-3 1374.177997 1374.177997 1374.177997 ZT4-7 1233.012197 1233.012197 1233.012197 ZT8-11 1038.340254 1038.340254 1038.340254 ZT12-15 1169.9246515 1169.9246515 1169.9246515 ZT16-19 1053.1160535 1053.1160535 1053.1160535 ZT20-23 1031.083656 1031.083656 1031.083656