condition mean min max ZT0-3 91.676351 91.676351 91.676351 ZT4-7 298.973293 298.973293 298.973293 ZT8-11 239.024296 239.024296 239.024296 ZT12-15 155.590314 155.590314 155.590314 ZT16-19 71.3824045 71.3824045 71.3824045 ZT20-23 53.889281 53.889281 53.889281