condition mean min max ZT0-3 1242.752367 1242.752367 1242.752367 ZT4-7 1097.0594115 1097.0594115 1097.0594115 ZT8-11 1327.3839145 1327.3839145 1327.3839145 ZT12-15 1320.4149665 1320.4149665 1320.4149665 ZT16-19 1309.0472395000002 1309.0472395000002 1309.0472395000002 ZT20-23 1301.348363 1301.348363 1301.348363