condition mean min max ZT0-3 496.54999999999995 496.54999999999995 496.54999999999995 ZT4-7 639.5 639.5 639.5 ZT8-11 520.7 520.7 520.7 ZT12-15 588.0 588.0 588.0 ZT16-19 551.1500000000001 551.1500000000001 551.1500000000001 ZT20-23 697.6 697.6 697.6