condition mean min max ZT0-3 268.4 268.4 268.4 ZT4-7 165.7 165.7 165.7 ZT8-11 206.89999999999998 206.89999999999998 206.89999999999998 ZT12-15 242.3 242.3 242.3 ZT16-19 337.75 337.75 337.75 ZT20-23 388.85 388.85 388.85